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Porsche 911 & 912 (1965-1989) Accessories

Additives & Boosters

BG 245: Premium Diesel Fuel System Cleaner

BG245

Product Information

BG 245: Premium Diesel Fuel System Cleaner
325 ml

New improved chemistry for modern higher pressure diesels

Sister product to BG 244 from BG Products, BG 245 is a newer premium fuel system cleaner for diesel systems. The BG range is regarded by professionals as the best fuel system cleaners of their kind.

Today’s diesels can produce more power with less fuel than ever before. Injector tips in High Pressure Common Rail injection (HPCR) systems are designed to handle produce twice as much injection pressure as mechanical fuel injection. However, diesel fuel is not, being notoriously inconsistent and therefore a threat to HPCR systems. Injector deposits at a miniscule quantity can cause sticking and carbon begins laying on the fuel filter until it reaches a point of plugging.

New BG 245 Premium Diesel Fuel System Cleaner removes and dissolves deposits from the entire diesel injection system, including inside fuel injectors and combustion chambers. Plus, BG 245 contains a fuel lubricity agent to protect components from wear and cetane improver for cold starts.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

BG245

245

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3 3 3

BG CF-5: Fuel System Cleaner, 325 ml

BG203E

Product Information

BG CF-5: Maintenance-level Fuel Treatment
325 ml

BG CF-5 is the maintenance-level fuel treatment equivalent of BG44K. It is also dual fuel as it will treat petrol or diesel cars. CF-5 (CF stands for Carbon Fighter) is excellent for preventing deposit related issues from occurring.

CF-5 works by protecting the fuel system from harmful combustion deposits - including those exacerbated by now E10 ethanol fuel. It will keep injectors, pistons, fuel intake components and sensors clean and free of damaging deposits and corrosion.

CF-5 helps to maintain and improve performance and mpg.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

BG203E

PN 203

BG203

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BG DOC: Diesel Oil Conditioner, 325ml

BG112

Product Information

BG DOC: Diesel Oil Conditioner
325 ml

BG DOC Diesel Oil Conditioner is designed to condition oil in modern high-output diesel engines.

Modern diesel engines operate at high temperatures and pressures. This puts a lot of demand on diesel engine oils and the additives they contain. Hydraulically activated fuel injectors increase oil pressures and emissions devices increase soot accumulation in oil. These systems test the limits of engine oil. Under the right conditions, heat causes sulphur from fuel to combine with entrained moisture to create sulfuric acid. This acid wreaks havoc on engines, causing corrosive wear and severe damage to engine components.

BG DOC Diesel Oil Conditioner maintains like-new diesel engine power and performance, neutralises acids and acid corrosion, reduces friction and wear on engine parts, stabilises viscosity, prevents sludge through increased oxidation and soot control.

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Related, superseded, cross reference or alternative numbers for comparison.

BG112

PN 112E

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BG EPR: Engine Performance and Compression Restorer, 325ml

BG109

Product Information

BG EPR: Engine Performance and Compression Restorer
325ml

A revolutionary formula with proven “ring-clean” technology. BG 109 Engine Performance Restoration is a quick and effective blend of cleaners that will soften, emulsify and dissolve those hard to remove fuel gums that clog rings and will usually do it in 15 minutes or less.

Modern engines operate at high temperatures. Combined with prolonged drain intervals and reduced engine cooling, automotive engine oil is under a lot of stress. Continuous thermal and oxidative breakdown contributes to oil thickening, heat retention and deposit formation. Heavy deposits can impede normal piston-ring function; thus reducing fuel economy, lowering power output, and increasing harmful exhaust emissions and oil consumption. Compression will increase with removal of these deposits.

Safe for use in petrol, diesel and rotary engines.

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Related, superseded, cross reference or alternative numbers for comparison.

BG109

PN 109E

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BG MGC: Multi Gear Concentrate oil supplement, 177ml

BG325

Product Information

BG MGC: Multi Gear Concentrate oil supplement
177ml

• Reduces temperatures in Transmission,
• Reduces wear,
• Reduces noise in Limited Slip, differentials,
• Improves manual transmission characteristics,
• Reduces maintenance costs,
• Improves water separation,
• Extends oil life

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BG325

PN 325E

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BG MOA: Engine Oil Supplement Advanced Formula

BG115

Product Information

BG MOA: Engine Oil Supplement Advanced Formula
325 ml

BG MOA Advanced Formula Engine Oil Conditioner is designed to enhance engine oil and extend engine oil life. The unique blend of additives in the product maintains engine cleanliness and performance under high load conditions.

Modern operating conditions of a car in the urban cycle (warm-ups, start-stop, short trips, extended intervals between oil changes) and high operating temperatures lead to a rapid depletion of the required additive package in the engine oil. This leads to the accumulation of more unburned fuel and other combustion products in the engine oil, which leads to the rapid oxidation of engine oils. Oxidation causes oil to thicken and deposits in the crankcase, oil filter, oil passages and other critical internal engine surfaces.

BG Advanced Formula MOA® Engine Oil Conditioner is designed to maximize the performance of synthetic and mineral engine oils and extend engine oil life.
The product prevents oxidation and an increase in the viscosity of the engine oil even under high load conditions.
Keeps compression rings, lifters, tensioners and other engine components clean for long engine life and lowers maintenance costs.
Excellent for gasoline engine use.
Compatible with synthetic and mineral motor oils.

Benefits:
increases the strength of the oil film
prevents oxidation and oil thickening
prevents the formation of sludge and varnish deposits when driving in the urban cycle
protects against rust and corrosion
provides increased power and performance
reduces harmful emissions into the atmosphere

Excellent long-term protection of engine parts against wear!

Used by:
Restoring the elasticity of the elements of the oil system of a gasoline engine
Restoring the elasticity of the elements of the oil system of a diesel engine
Engine oil protection

Mode of application:

For continuous engine protection, add one can (325 ml) of 4-5 liters of engine oil at every oil change
Add to the crankcase in the event of a drop in the oil level to enhance its properties between replacements
Do not overfill the crankcase

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

BG115

PN 115E

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3 3 3

LIQUI MOLY Carburetor and Valve Cleaner 300ml

LM1818

Product Information

LIQUI MOLY Carburetor and Valve Cleaner – 300ml

LIQUI MOLY Carburetor and Valve Cleaner is a petrol fuel additive designed to remove deposits from carburettors, valves, spark plugs and combustion chambers.

Fits:

Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 356 1950-55
Porsche 356A 1955-59
Porsche 356B 1959-63
Porsche 356C 1963-65
Porsche 914 (1970-1976)

It helps restore engine performance, improve combustion and prevent new deposits from forming. Suitable for classic Porsche engines.

What Does It Do?

The additive cleans deposits from carburettors and engine components exposed to fuel and combustion.

It helps improve engine performance, maintain compression, reduce the risk of knocking combustion and prevent carburettor icing.

Why Is It Important?

Over time, fuel residues and combustion deposits can accumulate within the engine.

These deposits may contribute to:

Rough or uneven engine operation
Reduced engine performance
Poor throttle response
Increased risk of engine knocking
Carburettor icing in suitable conditions

When Should It Be Used?

Use as a preventative fuel system treatment or when deposits are suspected of affecting engine operation.

Particularly useful for classic Porsche vehicles with carburettors and petrol engines requiring periodic fuel system maintenance.

Application & Dosage

Add directly to the petrol tank.
One 300ml can treats up to 70 litres of petrol.
The additive mixes automatically with the fuel.
Recommended treatment interval: every 2,000km.
The fuel tank should be at least half full when adding.
LIQUI MOLY also permits direct application to the carburettor, following the manufacturer's instructions.

Key Features

300ml container
Cleans carburettors, valves and combustion chambers
Helps remove deposits from spark plugs
Prevents new deposits from forming
Supports engine performance and compression
Reduces the risk of knocking combustion
Helps prevent carburettor icing
Provides corrosion protection
Tested for turbochargers and catalytic converters
Suitable for petrol engines

LIQUI MOLY Carburettor & Valve Cleaning Additives for Porsche

Keeping the fuel system and combustion components clean helps maintain reliable performance in classic and modern Porsche petrol engines.

LIQUI MOLY Carburetor and Valve Cleaner removes deposits and helps prevent further build-up, making it particularly useful for carburettor-equipped Porsche 356, 911 and 912 models.

It can also be used in compatible fuel-injected Porsche petrol engines as part of regular maintenance.

4 4 4 4

LIQUI MOLY Cera Tec Wear Protection Additive 300ml

LM3721

Product Information

LIQUI MOLY Cera Tec Wear Protection Additive – 300ml

LIQUI MOLY Cera Tec is a high-performance ceramic engine oil additive developed to reduce friction, minimise wear and provide long-lasting protection for internal engine components.

Its advanced formulation combines microscopic ceramic particles with chemical friction modifiers to help protect metal surfaces, improve smooth running and reduce wear during cold starts and normal operation. Can be used in petrol, in diesel engines and compatible manual transmissions. Not to be used in automatic or PKD gearboxes

Porsche Model Compatibility

Cera Tec is suitable for consideration in Porsche models equipped with compatible conventional oil-lubricated petrol or diesel engines:

These are potential applications based on LIQUI MOLY's general engine compatibility, not individual Porsche model approvals. Check the engine oil capacity, Porsche lubricant requirements and suitability of aftermarket additives before use.

Not intended for the electric drive systems of the Porsche Taycan or all-electric Macan.

What Does It Do?

Cera Tec uses microscopic ceramic particles and chemical friction modifiers to reduce direct metal-to-metal contact inside the engine.

This helps:

Reduce friction and mechanical wear
Protect components during cold starts
Improve engine smoothness
Provide additional protection under high loads
Support long-term engine durability

Why Is It Important?

Internal engine components experience friction whenever the engine operates, particularly during cold starts and under heavy loads.

Cera Tec provides an additional wear-protection treatment to complement the engine oil, helping reduce friction between moving metal surfaces.

When Should It Be Used?

Cera Tec can be added during routine engine oil servicing, preferably when filling with fresh engine oil.

LIQUI MOLY states that its protective effect can last for up to 50,000km.

It is a preventative wear-protection additive rather than a repair for existing mechanical damage.

Application & Dosage

Shake the container thoroughly before use.
Add directly to the engine / gearbox oil, ideally during an oil change.
One 300ml container treats approximately 3–5 litres of oil.
Adjust the quantity for larger Porsche oil capacities.
Follow the manufacturer's normal oil change intervals.
Do not exceed the recommended dosage.

Cera Tec is also suitable for certain manual transmissions, pumps and compressors.

Do not use in automatic transmissions, PDK/DCT gearboxes or wet-clutch differentials.

Key Features

Advanced ceramic wear-protection technology
LIQUI MOLY product reference 3721
300ml container
Reduces friction and internal engine wear
Helps protect during cold starts
High thermal and mechanical stability
Compatible with commercially available engine oils
Suitable for compatible turbocharged engines
Compatible with catalytic converters and particulate filters
Long-term protection for up to 50,000km
Suitable for compatible manual transmissions
Not suitable for wet-clutch applications

LIQUI MOLY Cera Tec Engine Oil Additives for Porsche

LIQUI MOLY Cera Tec provides additional ceramic-based wear protection for compatible Porsche petrol and diesel engines, including classic air-cooled 911 models and modern water-cooled applications.

Its combination of ceramic particles and friction modifiers helps reduce mechanical friction, improve smooth running and protect engine components under demanding operating conditions.

Design911 supplies LIQUI MOLY engine oil additives, lubricants and maintenance products for classic and modern Porsche vehicles.

3 3 3

LIQUI MOLY Injection Cleaner 300ml

LM1803

Product Information

LIQUI MOLY Injection Cleaner – 300ml

LIQUI MOLY Injection Cleaner is a petrol fuel additive designed to remove deposits from fuel injectors, intake valves, spark plugs and combustion chambers.

Fits:

Porsche Boxster 986 2.5L 1997-99
Porsche Boxster 986 2.7L 1999-02
Porsche Boxster S 986 3.2L 1999-02
Porsche Boxster 986 2.7L 2003-04
Porsche Boxster S 986 3.2L 2003-04
Porsche Boxster 987 2.7L 2005-08/08
Porsche Boxster 987 S 3.2/3.4L 2005-08/08
Porsche Boxster 987 MKII 2.9L 2009-12
Porsche Boxster S 987 MKII 3.4L 2009-12
Porsche Boxster 981 2.7L 2012-16
Porsche Boxster 981 S / GTS 3.4L 2012-16
Porsche Boxster 981 Spyder 3.8L 2016
Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Porsche 964 (911) TURBO 3.3L 1991-93
Porsche 964 (911) TURBO 3.6L 1991-93
Porsche 993 (911) C2 1994-97
Porsche 993 (911) C4 1994-97
Porsche 993 (911) RS 1994-97
Porsche 993 (911) C2S 1994-97
Porsche 993 (911) C4S 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) GT2 1994-97
Porsche 993 (911) TURBO S 1994-97
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 C2 3.6L 09/01-2005
Porsche 996 C4 3.6L 09/01-2005
Porsche 996 C4S 3.6L 09/01-2005
Porsche 996 TURBO 2000-05
Porsche 996 GT2 2001-05
Porsche 996 GT3 MKI 1999-02
Porsche 996 GT3 MKII 2003>>
Porsche 996 GT3 RS 2003-04
Porsche 997 MK1 Carrera 2 3.6L 2005-08
Porsche 997 MK1 Carrera 2S 3.8L 2005-08
Porsche 997 MK1 Carrera 4 3.6L 2005-08
Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Porsche 997 MK1 TURBO 2007-09
Porsche 997 MK1 GT3 / GT3 RS 2007-09
Porsche 997 MK1 GT2 2007-09
Porsche 997 MKII Carrera C2 3.6L 2009-12
Porsche 997 MKII Carrera C4 3.6L 2009-12
Porsche 997 MKII Carrera C2S 3.8L 2009-12
Porsche 997 MKII Carrera C4S 3.8L 2009-12
Porsche 997 MKII GT3 / GT3 RS 2010-11
Porsche 997 MKII Turbo 2010-13
Porsche 997 MKII GT2 RS 2011-13
Porsche Cayman 2.7L 987C 2006-08
Porsche Cayman S 3.4L 987C 2005-08
Porsche Cayman 2.9L 987C MKII 2009-12
Porsche Cayman S / R 3.4L 987C MKII 2009-12
Porsche Cayman 2.7L 981 2013-16
Porsche Cayman S / GTS 3.4L 981 2013-16
Porsche Cayman GT4 3.8L 2015-16
Porsche 924 2.0L 1976-79
Porsche 924 2.0L 1980-85
Porsche 924 Turbo 2.0L 1979-81
Porsche 924 Turbo 2.0L 1982-84
Porsche 924 Carrera GT 2.0L 1981
Porsche 924 Carrera GTS 2.0L 1982
Porsche 924S 2.5L 1986-87
Porsche 924S 2.5L 1988
Porsche 944 2.5L 8V 1982-87
Porsche 944 2.7L 8V 1988-89
Porsche 944S 2.5L 16V 1987-88
Porsche 944S2 3.0L 16V 1989-91
Porsche 944 Turbo 2.5L 8V 1985-88
Porsche 944 Turbo 2.5L 8V 1989-91
Porsche 944 Turbo S 2.5L 8V 1988
Porsche 968 3.0L 1992-95
Porsche 968 Sport 3.0L 1994-95
Porsche 968 CS 3.0L 1993-95
Porsche 968 Turbo S 3.0L 1993-94
Porsche 928 4.5L 1978-82
Porsche 928S 4.7L 1981-83
Porsche 928S2 4.7L 1984-86
Porsche 928S4 5.0L 1987-92
Porsche 928GT 5.0L 1989-91
Porsche 928GTS 5.4L 1992-95
Porsche 356 1950-55
Porsche 356A 1955-59
Porsche 356B 1959-63
Porsche 356C 1963-65
Porsche 914 (1970-1976)
Porsche 912E 4CYL 1976

It helps improve throttle response, reduce rough engine running and maintain efficient combustion. Suitable for compatible classic and modern Porsche petrol engines, including turbocharged models and vehicles fitted with catalytic converters.

LIQUI MOLY specifies suitability for all petrol engines, including turbocharged and catalytic-converter-equipped vehicles. These Porsche applications are indicative rather than individually approved.

Not suitable for diesel engines. In direct-injection engines, a fuel-tank additive does not directly clean the backs of intake valves.

What Does It Do?

Injection Cleaner removes deposits from petrol injection systems and fuel-contacted engine components.

It helps restore consistent fuel delivery, improve throttle response and reduce starting difficulties caused by contamination.

Why Is It Important?

Over time, fuel residues and combustion deposits can affect engine operation.

Common symptoms include:

Rough or uneven idling
Poor throttle response
Difficult starting
Reduced engine performance
Deposits affecting injector operation

When Should It Be Used?

Use as a preventative fuel system treatment or when injector deposits are suspected of causing running problems.

Suitable for regular maintenance of petrol-powered Porsche vehicles, particularly older or infrequently driven models.

Application & Dosage

Add directly to the petrol tank.
One 300ml can treats up to 70 litres of petrol.
The additive mixes automatically with the fuel.
Provides a cleaning effect lasting up to 2,000km.
Repeat treatment if symptoms return.

Key Features

Product reference 1803 300ml container
Cleans petrol injection systems
Helps remove injector and combustion deposits
Reduces starting difficulties and rough running
Improves throttle response
Supports efficient engine performance
Helps prevent new deposits forming
Tested for turbochargers and catalytic converters
Suitable for petrol engines

LIQUI MOLY Fuel Injection Cleaners & Petrol Additives for Porsche

Keeping fuel injectors and combustion components clean helps maintain reliable engine performance, smooth running and efficient fuel delivery.

LIQUI MOLY Injection Cleaner helps remove deposits and prevent further build-up in compatible Porsche petrol engines, making it useful for both classic and modern models.

It is particularly relevant for Porsche 911, 944, 928, Boxster and Cayman owners seeking a straightforward fuel system maintenance treatment.

LIQUI MOLY Petrol Stabilizer 250ml.

LM21646

Product Information

LIQUI MOLY Petrol Stabilizer – 250ml

LIQUI MOLY Petrol Stabilizer is a fuel additive designed to protect petrol against ageing and oxidation during vehicle storage. Ideal for classic, seasonal and infrequently driven Porsche vehicles, it helps prevent corrosion throughout the fuel system and supports reliable engine starting after extended periods of inactivity.

Fits:

Porsche Boxster 986 2.5L 1997-99
Porsche Boxster 986 2.7L 1999-02
Porsche Boxster S 986 3.2L 1999-02
Porsche Boxster 986 2.7L 2003-04
Porsche Boxster S 986 3.2L 2003-04
Porsche Boxster 987 2.7L 2005-08/08
Porsche Boxster 987 S 3.2/3.4L 2005-08/08
Porsche Boxster 987 MKII 2.9L 2009-12
Porsche Boxster S 987 MKII 3.4L 2009-12
Porsche Boxster 981 2.7L 2012-16
Porsche Boxster 981 S / GTS 3.4L 2012-16
Porsche Boxster 981 Spyder 3.8L 2016
Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Porsche 964 (911) TURBO 3.3L 1991-93
Porsche 964 (911) TURBO 3.6L 1991-93
Porsche 993 (911) C2 1994-97
Porsche 993 (911) C4 1994-97
Porsche 993 (911) RS 1994-97
Porsche 993 (911) C2S 1994-97
Porsche 993 (911) C4S 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) GT2 1994-97
Porsche 993 (911) TURBO S 1994-97
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 C2 3.6L 09/01-2005
Porsche 996 C4 3.6L 09/01-2005
Porsche 996 C4S 3.6L 09/01-2005
Porsche 996 TURBO 2000-05
Porsche 996 GT2 2001-05
Porsche 996 GT3 MKI 1999-02
Porsche 996 GT3 MKII 2003>>
Porsche 996 GT3 RS 2003-04
Porsche Cayman 2.7L 987C 2006-08
Porsche Cayman S 3.4L 987C 2005-08
Porsche Cayman 2.9L 987C MKII 2009-12
Porsche Cayman S / R 3.4L 987C MKII 2009-12
Porsche Cayman 2.7L 981 2013-16
Porsche Cayman S / GTS 3.4L 981 2013-16
Porsche Cayman GT4 3.8L 2015-16
Porsche 924 2.0L 1976-79
Porsche 924 2.0L 1980-85
Porsche 924 Turbo 2.0L 1979-81
Porsche 924 Turbo 2.0L 1982-84
Porsche 924 Carrera GT 2.0L 1981
Porsche 924 Carrera GTS 2.0L 1982
Porsche 924S 2.5L 1986-87
Porsche 924S 2.5L 1988
Porsche 944 2.5L 8V 1982-87
Porsche 944 2.7L 8V 1988-89
Porsche 944S 2.5L 16V 1987-88
Porsche 944S2 3.0L 16V 1989-91
Porsche 944 Turbo 2.5L 8V 1985-88
Porsche 944 Turbo 2.5L 8V 1989-91
Porsche 944 Turbo S 2.5L 8V 1988
Porsche 968 3.0L 1992-94
Porsche 968 Sport 3.0L 1994-95
Porsche 968 CS 3.0L 1993-95
Porsche 968 Turbo S 3.0L 1993-94
Porsche 928 4.5L 1978-82
Porsche 928S 4.7L 1981-83
Porsche 928S2 4.7L 1984-86
Porsche 928S4 5.0L 1987-92
Porsche 928GT 5.0L 1989-91
Porsche 928GTS 5.4L 1992-95
Porsche 356 1950-55
Porsche 356A 1955-59
Porsche 356B 1959-63
Porsche 356C 1963-65
Porsche 914 (1970-1976)
Porsche 912E 4CYL 1976

Particularly useful for classic Porsche 356, 911, 912 and 914 models, as well as modern Porsche sports cars stored over winter.

LIQUI MOLY states that the additive is suitable for all petrol engines and has been tested for use with turbochargers and catalytic converters.

The list represents general petrol-engine compatibility rather than individual Porsche approvals. It is not intended for diesel engines or fully electric vehicles.

What Does It Do?

Petrol Stabilizer helps preserve fuel quality by reducing oxidation and ageing during storage.

It also protects fuel system components against corrosion, helping maintain reliable operation when the vehicle is returned to use.

Why Is It Important?

Petrol can deteriorate when stored for extended periods, particularly in vehicles that are driven infrequently.

Fuel ageing and oxidation can contribute to deposits, corrosion and starting difficulties after storage.

When Should It Be Used?

Use before placing a Porsche into seasonal or long-term storage.

Particularly suitable for classic Porsche models, weekend cars and vehicles that remain unused for several months.

It can also be used regularly in infrequently driven petrol engines.

Application & Dosage

Add directly to the petrol tank.
Use 25ml for every 5 litres of petrol.
One 250ml bottle treats up to 50 litres of petrol.
Before storage, add the correct quantity and run the engine for approximately 10 minutes.
Repeat the dosage after refuelling when continued protection is required.

Key Features

LIQUI MOLY Petrol Stabilizer
Product reference 21646
250ml dispensing bottle
Protects petrol against ageing and oxidation
Helps prevent fuel system corrosion
Supports reliable starting after storage
Long-lasting protective effect
Suitable for all petrol engines
Tested for turbochargers and catalytic converters
Ideal for classic and infrequently driven Porsche vehicles

LIQUI MOLY Petrol Stabilizers & Porsche Fuel Storage Additives

Classic and modern Porsche petrol engines benefit from properly maintained fuel during extended periods of inactivity.

LIQUI MOLY Petrol Stabilizer helps preserve petrol quality, protect fuel system components and reduce storage-related problems.

Particularly useful for classic Porsche 356, 911, 912 and 914 models, as well as modern Porsche sports cars stored over winter.

LIQUI MOLY Pro-Line Oil Leak Stop 1ltr

LM5182

Product Information

LIQUI MOLY Pro-Line Oil Leak Stop – 1ltr

LIQUI MOLY Pro-Line Oil Leak Stop is a professional engine oil additive designed to help reduce oil leaks, excessive oil consumption and blue exhaust smoke caused by ageing engine seals.

Fits:

Porsche Boxster 986 2.5L 1997-99
Porsche Boxster 986 2.7L 1999-02
Porsche Boxster S 986 3.2L 1999-02
Porsche Boxster 986 2.7L 2003-04
Porsche Boxster S 986 3.2L 2003-04
Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Porsche 964 (911) TURBO 3.3L 1991-93
Porsche 964 (911) TURBO 3.6L 1991-93
Porsche 993 (911) C2 1994-97
Porsche 993 (911) C4 1994-97
Porsche 993 (911) RS 1994-97
Porsche 993 (911) C2S 1994-97
Porsche 993 (911) C4S 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) GT2 1994-97
Porsche 993 (911) TURBO S 1994-97
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 C2 3.6L 09/01-2005
Porsche 996 C4 3.6L 09/01-2005
Porsche 996 C4S 3.6L 09/01-2005
Porsche 996 TURBO 2000-05
Porsche 996 GT2 2001-05
Porsche 996 GT3 MKI 1999-02
Porsche 996 GT3 MKII 2003>>
Porsche 996 GT3 RS 2003-04
Porsche 924 2.0L 1976-79
Porsche 924 2.0L 1980-85
Porsche 924 Turbo 2.0L 1979-81
Porsche 924 Turbo 2.0L 1982-84
Porsche 924 Carrera GT 2.0L 1981
Porsche 924 Carrera GTS 2.0L 1982
Porsche 924S 2.5L 1986-87
Porsche 924S 2.5L 1988
Porsche 944 2.5L 8V 1982-87
Porsche 944 2.7L 8V 1988-89
Porsche 944S 2.5L 16V 1987-88
Porsche 944S2 3.0L 16V 1989-91
Porsche 944 Turbo 2.5L 8V 1985-88
Porsche 944 Turbo 2.5L 8V 1989-91
Porsche 944 Turbo S 2.5L 8V 1988
Porsche 968 3.0L 1992-94
Porsche 968 Sport 3.0L 1994-95
Porsche 968 CS 3.0L 1993-95
Porsche 968 Turbo S 3.0L 1993-94
Porsche 928 4.5L 1978-82
Porsche 928S 4.7L 1981-83
Porsche 928S2 4.7L 1984-86
Porsche 928S4 5.0L 1987-92
Porsche 928GT 5.0L 1989-91
Porsche 928GTS 5.4L 1992-95
Porsche 356 1950-55
Porsche 356A 1955-59
Porsche 356B 1959-63
Porsche 356C 1963-65
Porsche 914 (1970-1976)
Porsche 912E 4CYL 1976

Its formulation helps restore flexibility to hardened or shrunken rubber and plastic seals, improving their sealing performance while supporting quieter engine operation.

Confirm compatibility with the vehicle's engine oil requirements before use. Not applicable to fully electric Porsche powertrains.

What Does It Do?

Pro-Line Oil Leak Stop helps regenerate rubber and plastic engine seals, including shaft seals and valve stem seals.

It can reduce oil consumption caused by deteriorated seals and help minimise blue exhaust smoke associated with oil entering the combustion chambers.

The additive also helps maintain oil viscosity and reduce engine noise.

Why Do Engine Oil Leaks Occur?

Common causes include:

Hardened or shrunken engine seals
Age-related rubber deterioration
Heat and repeated temperature changes
Porous or ageing sealing materials
Worn or damaged engine components

When Should It Be Used?

Use when minor engine oil leaks or increased oil consumption may be caused by ageing rubber or plastic seals.

It is particularly useful for older Porsche engines where seals have hardened over time.

The additive cannot repair cracked housings, damaged gaskets or severely worn mechanical components.

Application & Dosage

Add directly to the existing engine oil.
One 1-litre container treats up to 15 litres of engine oil.
Adjust the dosage proportionally for smaller oil capacities.
Can be added at any time.
After adding, warm the engine or drive the vehicle.
The sealing effect typically begins after approximately 600–800km.
LIQUI MOLY recommends repeating the treatment after each oil change for lasting results.

Key Features

LIQUI MOLY Pro-Line professional additive
1-litre container
Helps reduce leaks from ageing engine seals
Restores flexibility to rubber and plastic seals
Helps reduce engine oil consumption
Can reduce blue exhaust smoke
Supports quieter engine operation
Suitable for petrol and diesel engines
Compatible with engines fitted with diesel particulate filters
Mixes with commercially available engine oils
Not suitable for wet-clutch motorcycles

LIQUI MOLY Oil Leak Stop Additives for Porsche Engines

Ageing engine seals can become hard, brittle or shrunken, allowing oil to escape and increasing oil consumption.

LIQUI MOLY Pro-Line Oil Leak Stop helps restore the flexibility of suitable rubber and plastic seals, making it a useful maintenance treatment for compatible classic and modern Porsche engines.

It may be particularly beneficial for older Porsche 911, 964, 993, 944 and 928 models experiencing minor leaks caused by deteriorated seals.

LIQUI MOLY Pro-Line Turbocharger Additive 20g. Porsche Turbocharged Engines

LM21651

Product Information

LIQUI MOLY Pro-Line Turbocharger Additive – 20g

LIQUI MOLY Pro-Line Turbocharger Additive is a specialist lubricant designed to protect new turbochargers during installation and initial start-up.

Applied before the turbocharger oil supply line is connected, it helps prevent dry running and damage caused by insufficient lubrication during the initial running-in phase.

Vehicle Compatibility

Porsche turbocharged petrol and diesel engines
Other turbocharged vehicles

Suitable for all turbochargers and compatible with commercially available engine oils. Always follow the turbocharger manufacturer's installation instructions.

What Does It Do?

The additive provides initial lubrication to the turbocharger, protecting internal moving components before the engine oil supply is fully established.

Its emergency-running properties help reduce the risk of damage caused by temporary oil starvation during initial start-up.

Why Is It Important?

A newly installed turbocharger may not receive full engine oil pressure immediately after starting.

Without adequate initial lubrication, the turbocharger shaft and bearings can experience excessive friction and premature wear.

When Should It Be Used?

Use when installing a new or replacement turbocharger, before the engine is started.

It is particularly useful during turbocharger replacement, engine rebuilding and professional workshop repairs.

Checks & Application

Fill the turbocharger oil inlet passage completely with LIQUI MOLY Pro-Line Turbocharger Additive before connecting the oil supply line.

Ensure the turbocharger oil feed and return lines are clean and correctly installed. Follow the manufacturer's recommended priming and start-up procedures.

Key Features

LIQUI MOLY Pro-Line professional workshop product
Product reference 21651 20g plastic tube
Protects against dry running during initial start-up
Helps prevent damage from insufficient lubrication
Excellent emergency-running properties
Improves new turbocharger operational reliability
Compatible with commercially available engine oils
Suitable for all turbochargers

LIQUI MOLY Turbocharger Additives & Porsche Turbo Installation Products

Turbochargers operate at extremely high speeds and require a reliable oil supply to protect their internal bearings and rotating components.

LIQUI MOLY Pro-Line Turbocharger Additive provides additional protection during the critical initial start-up period following turbocharger installation.

Suitable for compatible Porsche turbocharged engines, it is a useful workshop product for turbocharger replacement and engine rebuilding.

3 3 3

LIQUI MOLY Valve Clean 150ml

LM2952

Product Information

LIQUI MOLY Valve Cleaner – 150ml

LIQUI MOLY Valve Cleaner is a petrol fuel additive designed to remove deposits from engine valves and combustion chambers while helping prevent further build-up.

Fits:

Porsche Boxster 986 2.5L 1997-99
Porsche Boxster 986 2.7L 1999-02
Porsche Boxster S 986 3.2L 1999-02
Porsche Boxster 986 2.7L 2003-04
Porsche Boxster S 986 3.2L 2003-04
Porsche Boxster 987 2.7L 2005-08/08
Porsche Boxster 987 S 3.2/3.4L 2005-08/08
Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Porsche 964 (911) TURBO 3.3L 1991-93
Porsche 964 (911) TURBO 3.6L 1991-93
Porsche 993 (911) C2 1994-97
Porsche 993 (911) C4 1994-97
Porsche 993 (911) RS 1994-97
Porsche 993 (911) C2S 1994-97
Porsche 993 (911) C4S 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) GT2 1994-97
Porsche 993 (911) TURBO S 1994-97
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 C2 3.6L 09/01-2005
Porsche 996 C4 3.6L 09/01-2005
Porsche 996 C4S 3.6L 09/01-2005
Porsche 996 TURBO 2000-05
Porsche 996 GT2 2001-05
Porsche 996 GT3 MKI 1999-02
Porsche 996 GT3 MKII 2003>>
Porsche 996 GT3 RS 2003-04
Porsche 997 MK1 Carrera 2 3.6L 2005-08
Porsche 997 MK1 Carrera 2S 3.8L 2005-08
Porsche 997 MK1 Carrera 4 3.6L 2005-08
Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Porsche 997 MK1 TURBO 2007-09
Porsche 997 MK1 GT3 / GT3 RS 2007-09
Porsche 997 MK1 GT2 2007-09
Porsche Cayman 2.7L 987C 2006-08
Porsche Cayman S 3.4L 987C 2005-08
Porsche 924 2.0L 1976-79
Porsche 924 2.0L 1980-85
Porsche 924 Turbo 2.0L 1979-81
Porsche 924 Turbo 2.0L 1982-84
Porsche 924 Carrera GT 2.0L 1981
Porsche 924 Carrera GTS 2.0L 1982
Porsche 924S 2.5L 1986-87
Porsche 924S 2.5L 1988
Porsche 944 2.5L 8V 1982-87
Porsche 944 2.7L 8V 1988-88
Porsche 944S 2.5L 16V 1987-88
Porsche 944S2 3.0L 16V 1989-91
Porsche 944 Turbo 2.5L 8V 1985-88
Porsche 944 Turbo 2.5L 8V 1989-91
Porsche 944 Turbo S 2.5L 8V 1988
Porsche 968 3.0L 1992-94
Porsche 968 Sport 3.0L 1994-95
Porsche 968 CS 3.0L 1993-95
Porsche 968 Turbo S 3.0L 1993-94
Porsche 928 4.5L 1978-82
Porsche 928S 4.7L 1981-83
Porsche 928S2 4.7L 1984-86
Porsche 928S4 5.0L 1987-92
Porsche 928GT 5.0L 1989-91
Porsche 928GTS 5.4L 1992-95
Porsche 356 1950-55
Porsche 356A 1955-59
Porsche 356B 1959-63
Porsche 356C 1963-65
Porsche 914 (1970-1976)
Porsche 912E 4CYL 1976

It supports engine performance, improves compression where deposits are affecting valve sealing and provides corrosion protection. Ideal for compatible classic and modern Porsche petrol engines.

LIQUI MOLY specifies this product for petrol engines with carburettors or manifold fuel injection. The models listed are indicative applications, not individual Porsche approvals. Confirm the engine's fuel-injection system before use.

For direct-injection Porsche engines, a fuel-tank additive will not directly wash the backs of the intake valves.

What Does It Do?

Valve Cleaner removes deposits from valves and combustion chambers, helping restore efficient engine operation and maintain performance.

It also provides corrosion protection and helps prevent new deposits from forming.

Why Is It Important?

Carbon and combustion deposits can accumulate over time, particularly in older or infrequently driven petrol engines.

Excessive deposits may contribute to rough running, reduced engine performance and poor valve sealing.

When Should It Be Used?

Use as a preventative fuel system treatment or when deposits are suspected of affecting engine performance.

Particularly useful for classic Porsche engines with carburettors or manifold fuel injection.

Application & Dosage

Add directly to the petrol tank when refuelling.
One 150ml can treats up to 75 litres of petrol.
Suitable for preventative maintenance or treatment of existing deposits.
Follow the manufacturer's instructions and avoid exceeding the recommended dosage.

Key Features

Product reference 2952
150ml container
Removes deposits from valves and combustion chambers
Helps prevent new deposits forming
Supports engine performance and compression
Provides corrosion protection
Suitable for carburettor and manifold-injection petrol engines
Tested for turbochargers and catalytic converters
Simple fuel-tank application

LIQUI MOLY Valve Cleaning Additives for Porsche Petrol Engines

Clean engine valves and combustion chambers help maintain efficient combustion, reliable running and consistent engine performance.

LIQUI MOLY Valve Cleaner is particularly suited to classic Porsche 356, 911, 912, 914, 944 and 928 petrol engines using compatible carburettor or manifold fuel-injection systems.

Its cleaning formulation helps remove existing deposits while reducing further build-up.

LIUQI MOLY Engine Flush Plus 300ml

LM8374

Product Information

LIQUI MOLY Engine Flush Plus – 300ml

LIQUI MOLY Engine Flush Plus is a powerful engine cleaning additive designed to remove harmful deposits, sludge and contaminants from the internal engine oil system before an oil change.

These are potential applications based on the product's general petrol and diesel engine suitability, not Porsche-specific approvals. Check vehicle requirements and engine oil capacity before use.

Its cleaning formula dissolves and suspends oil-soluble and oil-insoluble deposits, allowing them to be drained away with the old engine oil. This helps restore cleanliness, reduce wear and support efficient engine operation.

Not applicable to fully electric Porsche Taycan or Macan Electric powertrains.

What Does It Do?

Engine Flush Plus cleans the internal engine oil circuit by loosening and suspending accumulated deposits.

These contaminants are then removed when the old engine oil and filter are replaced.

Why Is It Important?

Over time, engine oil can accumulate sludge, varnish and other deposits caused by heat, combustion by-products and normal engine operation.

Excessive contamination may restrict oil circulation and increase engine wear.

When Should It Be Used?

Use immediately before an engine oil change when additional internal cleaning is required.

It may be useful during routine servicing, particularly where deposits or contamination are suspected. It is not a substitute for repairing mechanical faults or blocked oil passages.

Application & Dosage

Bring the engine oil to normal operating temperature.
Add Engine Flush Plus to the existing engine oil.
One 300ml container treats up to 6 litres of engine oil.
Allow the engine to idle for approximately 10 minutes.
Drain the old oil and replace the oil filter.
Refill with the correct manufacturer-approved engine oil.

Do not drive the vehicle during the flushing process. Follow LIQUI MOLY's instructions and the vehicle manufacturer's servicing requirements.

Key Features

LIQUI MOLY Engine Flush Plus
Product reference 8374
300ml container
Removes sludge and internal engine deposits
Cleans without engine dismantling
Suitable for petrol and diesel engines
Tested for turbochargers
Suitable for engines with catalytic converters and particulate filters
Compatible with commercially available engine oils
Gentle on common engine sealing materials
Suitable for engines with oil-bathed timing belts
Not suitable for wet-clutch motorcycles

LIQUI MOLY Engine Flush Plus for Porsche Engine Maintenance

Clean engine oil passages are essential for reliable lubrication and long-term engine performance.

LIQUI MOLY Engine Flush Plus helps remove accumulated deposits before an oil change, supporting cleaner engine operation in compatible Porsche petrol and diesel engines.

Suitable for consideration during servicing of classic air-cooled Porsche 911 models, modern Boxster and Cayman engines, and Porsche Cayenne, Macan and Panamera petrol or diesel engines.

Millers DIESEL POWER ECOMAX - ONE SHOT BOOST Fuel Additive (Performance Additive) - 250ML

6206MA

Product Information

Millers DIESEL POWER ECOMAX - ONE SHOT BOOST
Fuel Additive (Performance Additive)
250ML

Description
High specification diesel fuel treatment for enhanced combustion efficiency and engine cleanliness.

Application
For use in all diesel vehicles including modern Euro IV/V compliant engines. Empty complete contents into fuel tank before filling to ensure thorough mixing. One bottle treats 60 litres of fuel.

User Benefits
• Suitable for all diesel engines, especially Euro IV emission-compliant vehicles.
• Enhanced detergency package for quicker clean up and prolonged injector cleanliness.
• Increases Cetane rating of diesel by up to 5 numbers, which also provides a tangible improvement to vehicle performance.
• Improved combustion and engine cleanliness drastically reduces emissions of hydrocarbons (HC) and carbon dioxide.

Typical Characteristics:
- Specific Gravity (at 15°C) - 0.84
- Kinematic Viscosity (at 40°C, cSt)- 2.5
- Flash Point - 75°C
- Colour Appearance Odour - Pale Brown

Millers PETROL POWER ECOMAX ONE SHOT BOOST Fuel Additive (Performance Additive) - 250ML

6207MA

Product Information

Millers PETROL POWER ECOMAX - ONE SHOT BOOST
Fuel Additive (Performance Additive)
250ML

Description
An octane booster and detergent package adding 3 octane numbers to unleaded fuel.

Application
For use in all petrol engined vehicles. Add the contents of the bottle to 60 litres of petrol.

User Benefits
• Increases octane rating of fuel by up to 3 numbers. Increases power and mpg. Improved efficiency and cleanliness of petrol injectors
• Better cleanliness of carburettor internal components and jets. Improved inlet manifold and valve cleanliness condition. Reduces combustion chamber deposits
• Helps to control corrosion in the fuel system. Maintains catalyst efficiency and helps to invigorate catalytic convertors. Improved combustion and engine cleanliness drastically reduces emissions of hydrocarbon (HC), carbon dioxide (CO2 ) and nitrous oxide (NOx)
• Ideal for use as a pre-MOT test clean-up treatment

Typical Characteristics:
- Specific Gravity (at 15°C) - 0.84
- Kinematic Viscosity (at 40°C, cSt) - 2.5
- Flash Point - 6.6°C
- Colour Appearance Odour - Pale Brown

DISPLAYING 1 to 16 (of 25 products)

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About Additives & Boosters

Unlock your Porsche’s full potential with fuel additives and boosters from Design911. Our range includes performance-enhancing fuel treatments, injector cleaners, octane boosters, and system protectants designed to maintain optimal engine performance. Whether you’re improving combustion efficiency, restoring power, or protecting your Porsche’s fuel system from carbon build-up, our premium additives deliver results trusted by professionals and enthusiasts alike. Perfect for both classic and modern models, Design911 fuel additives ensure your Porsche runs cleaner, smoother, and more efficiently.

Fuel System Cleaners
High-performance fuel system cleaners that remove carbon deposits and improve injector performance for smoother engine operation and better fuel economy.

Octane Boosters
Premium Porsche octane boosters designed to enhance combustion, prevent knocking, and increase engine responsiveness under high-performance conditions.

Engine Protection Additives
Protective fuel additives that prevent corrosion, reduce wear, and extend the life of your Porsche’s engine and fuel system components.

Diesel & Petrol Treatments
Comprehensive range of Porsche-compatible fuel treatments for both petrol and diesel models. Improve efficiency, reduce emissions, and restore lost performance.

Fuel Stabilizers
Additives designed to keep stored fuel fresh and stable, ideal for Porsches used seasonally or in storage. Prevents varnish and deposit formation.

Professional Workshop Additives
Workshop-grade fuel additives formulated for maintenance, diagnostics, and performance testing — trusted by Porsche specialists and tuners.

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Additives & Boosters

Additives & Boosters