Gearbox Service Parts

LIQUI MOLY Fully Synthetic Gear Oil (GL 5) SAE 75W-90 for Gearbox and Differential (non LSD)

LIQUI MOLY Fully Synthetic Gear Oil (GL 5) SAE 75W-90 is a premium, high-performance gear lubricant developed for heavily loaded manual gearboxes, auxiliary transmissions, modern transaxle systems and final drives without limited-slip differentials.

Fits:
Gearbox

• 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 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

Always check the required Porsche oil specification and viscosity for the individual model before ordering.

Manufactured using fully synthetic base oils and advanced additive technology, this high-quality gear oil provides outstanding wear protection, excellent resistance to ageing and reliable lubrication under demanding operating conditions.

Its SAE 75W-90 viscosity grade delivers effective lubrication across a wide temperature range, maintaining smooth gear operation during cold starts while providing dependable protection at elevated operating temperatures.

The carefully balanced friction characteristics help reduce gearshift resistance and transmission noise, making it particularly suitable for compatible manual transmissions and transaxle assemblies requiring an API GL5 lubricant.

Specification: API GL5
Application: Compatible manual transmissions, transaxles and final drives without limited-slip differentials

What Does Fully Synthetic Gear Oil GL5 75W-90 Do?

Gear oil lubricates and protects the moving components inside manual transmissions, transaxles and differential assemblies.

These components operate under significant mechanical pressure and rely on the correct lubricant to reduce friction, control wear and maintain smooth operation.

LIQUI MOLY Fully Synthetic Gear Oil SAE 75W-90 is designed to:

• Lubricate gears, shafts, bearings and other moving components
• Provide excellent protection against wear
• Maintain a strong lubricating film under high mechanical loads
• Reduce friction and gearshift resistance
• Help minimise transmission noise
• Protect internal components against corrosion
• Maintain stable viscosity across changing temperatures
• Resist oxidation and premature ageing
• Support reliable operation under demanding driving conditions

Its fully synthetic formulation helps maintain consistent lubrication even when exposed to substantial temperature fluctuations.

Why Is High-Quality Gear Oil Important?

Manual gearboxes, transaxles and final drives rely on the correct lubricant to protect their internal components and maintain reliable operation.

Gear teeth and bearings are subjected to repeated mechanical loading, particularly during acceleration, deceleration and high-speed driving.

Using an unsuitable or deteriorated lubricant can contribute to increased friction, gear wear, transmission noise and difficult gear changes.

LIQUI MOLY Fully Synthetic Gear Oil GL5 75W-90 is formulated to provide excellent high-pressure protection and stable friction characteristics in compatible transmissions.

Why Choose Fully Synthetic SAE 75W-90 Gear Oil?

Fully synthetic gear oils offer excellent temperature stability and resistance to ageing compared with conventional mineral-based lubricants.

The SAE 75W-90 viscosity grade provides effective lubrication across a broad operating temperature range.

Benefits include:

• Reliable lubrication during cold starts
• Excellent protection at high operating temperatures
• Strong resistance to mechanical stress
• Consistent viscosity characteristics
• Reduced transmission noise
• Smooth gearshift operation in compatible gearboxes
• Excellent long-term wear protection

The correct viscosity and specification must always be selected according to the vehicle or transmission manufacturer's requirements.

Why Does Gear Oil Deteriorate?

Transmission and differential oils are exposed to heat, pressure and repeated mechanical loading throughout their service life.

Over time, these conditions can reduce the lubricant's protective properties.

Common causes of deterioration include:

• Prolonged exposure to high operating temperatures
• Oxidation and ageing of the oil
• Contamination from normal gear and bearing wear
• Heavy driving loads and repeated acceleration
• Moisture entering the transmission housing
• Incorrect oil levels Extended service intervals
• Use of an unsuitable lubricant specification

Deteriorated gear oil can contribute to increased noise, difficult gear changes and premature wear of internal transmission components.

When Should Gear Oil Be Replaced?

Gear oil should be replaced according to the vehicle or transmission manufacturer's recommended service schedule.

The appropriate interval depends on the gearbox design, operating conditions and vehicle usage.

A transmission or differential inspection may be required if the vehicle develops:

• Increased gearbox or final-drive noise
• Difficult or notchy gear changes
• Unusual whining or rumbling sounds
• Visible transmission oil leaks
• Contaminated or degraded lubricant
• Excessive metallic particles in the drained oil
• A scheduled gearbox or differential service

These symptoms may also indicate mechanical wear or other faults, so replacing the lubricant alone may not resolve the problem.

Porsche Manual Gearbox & Transaxle Applications

LIQUI MOLY Fully Synthetic Gear Oil GL5 SAE 75W-90 may be suitable for selected Porsche manual gearbox, transaxle or final-drive applications where the manufacturer specifies an API GL5 SAE 75W-90 lubricant.

However, transmission lubricant requirements vary considerably between models and gearbox generations.

This product must not be assumed suitable for every Porsche manual transmission, differential or transaxle.

In particular, some synchronised manual gearboxes require specific friction characteristics or lubricant approvals that differ from conventional API GL5 gear oils.

Always confirm the correct oil specification using the Porsche workshop information or the relevant gearbox manufacturer's recommendations.

This product is intended for compatible assemblies without limited-slip differentials. Where a limited-slip differential requires a dedicated LS lubricant, a suitable limited-slip gear oil should be selected instead.

Application & Service Instructions

Always follow the vehicle or transmission manufacturer's instructions regarding the correct oil specification, filling quantity and service interval.

Drain the existing gear oil using the recommended service procedure and inspect the old lubricant for signs of contamination or excessive wear.

LIQUI MOLY confirms that this product is miscible with residual mineral-based oil remaining in transmissions and axle drives during an oil change.

However, the correct lubricant specification must still be observed.

Fill the transmission or differential to the manufacturer's specified level and inspect for leaks following servicing.

Dispose of used gear oil responsibly through an approved waste oil collection facility.

LIQUI MOLY Fully Synthetic Hypoid Gear Oil (GL5) LS SAE 75W-140 for Gearbox and LSD

LIQUI MOLY Fully Synthetic Hypoid Gear Oil GL5 LS SAE 75W-140 is a premium, high-performance lubricant developed for heavily loaded hypoid gear systems and compatible limited-slip differentials.

Fits:
Gearbox

• 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 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 928 4.5L 1978-82 (Automatic)
  
• Porsche 928S 4.7L 1981-83 (Automatic)
  
• Porsche 928S2 4.7L 1984-86 (Automatic)
  
• Porsche 928S4 5.0L 1987-92 (Automatic)
  
• Porsche 928GTS 5.4L 1992-95 (Automatic)
  
• Porsche 968 3.0L 1992-94 (Tiptronic)

Always check the required Porsche oil specification and viscosity for the individual model before ordering.

Its fully synthetic formulation provides excellent protection against friction, wear and high operating temperatures. Special limited-slip (LS) additives help maintain smooth differential operation, reducing unwanted noise, vibration and judder during cornering.

Designed for demanding driving conditions, this gear oil is suitable for performance vehicles, motorsport applications and axle assemblies requiring SAE 75W-140 API GL5 LS lubricant.

What Does It Do?

The oil lubricates the gears, bearings and internal components within a differential or final drive assembly, reducing metal-to-metal contact and protecting against premature wear.

Its extreme-pressure additives provide additional protection under heavy loads, while the limited-slip formulation helps the differential operate smoothly and consistently.

Why Choose LIQUI MOLY 75W-140 GL5 LS?

• Fully synthetic formulation for high-performance applications
• SAE 75W-140 viscosity for demanding operating conditions
• API GL5 extreme-pressure protection
• Limited-slip additives help reduce differential chatter and judder
• Excellent resistance to high temperatures and oxidation
• Helps protect gears and bearings against wear
• Supports smooth, quiet differential operation
• Suitable for compatible hypoid axles and limited-slip differentials

Why Does Differential Oil Deteriorate?

Over time, repeated heating and cooling, heavy mechanical loads and contamination can reduce the oil's effectiveness.

High-performance driving and track use can accelerate deterioration, potentially increasing gear wear, operating noise and differential temperatures.

When Should It Be Replaced?

Replace differential oil according to the vehicle manufacturer's recommended service intervals, or more frequently where required for intensive track use or demanding operating conditions.

Inspection is also recommended if the differential develops unusual noises, juddering, excessive heat or signs of oil contamination.

Specifications & Approvals

• Product: Fully Synthetic Hypoid Gear Oil GL5 LS
• Viscosity: SAE 75W-140
• Classification: API GL5
• Formulation: Fully synthetic
• Application: Compatible hypoid axles and limited-slip differentials

LIQUI MOLY also lists manufacturer recommendations including BMW rear axle gear oil, Ford WSL-M2C 192-A, Scania STO 1:0, VME and selected ZF TE-ML specifications. These should not be interpreted as separate manufacturer approvals.

Porsche Compatibility

Suitable for selected Porsche differential and final drive applications where SAE 75W-140 API GL5 LS gear oil meets the manufacturer's requirements.

Not all Porsche transmissions or differentials use this specification. Always confirm the correct lubricant requirements before ordering, particularly for manual gearboxes, PDK transmissions and electronically controlled differential systems.

LIQUI MOLY Fully Synthetic Differential Oils & Hypoid Gear Lubricants

LIQUI MOLY Fully Synthetic Hypoid Gear Oil GL5 LS SAE 75W-140 provides reliable lubrication and wear protection for heavily loaded differential and axle assemblies.

Its combination of fully synthetic base oils, extreme-pressure additives and limited-slip friction modifiers makes it particularly suitable for compatible high-performance vehicles operating under demanding conditions.

LIQUI MOLY Hypoid Gear Oil (GL4/5) TDL SAE 75W-90 – 1 Litre / 20 Litres

LIQUI MOLY Hypoid Gear Oil (GL4/5) TDL SAE 75W-90 is a high-performance semi-synthetic lubricant developed for manual gearboxes, auxiliary transmissions and differentials.

Fits:

• 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 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

Its Total Drive Line (TDL) formulation combines excellent wear protection, stable viscosity and smooth gear-changing performance, even under demanding operating conditions and fluctuating temperatures.

What Does It Do?

This gear oil lubricates gears, bearings and transmission components, reducing friction and wear while supporting smooth gear changes and reliable differential operation.

Why Does Gear Oil Deteriorate?

Common causes include:

• High operating temperatures
• Heavy mechanical loading
• Contamination from component wear
• Moisture ingress
• Extended service intervals

When Should It Be Replaced?

Replace according to the vehicle manufacturer's service schedule or when the oil becomes contaminated or degraded.

Gearbox noise, difficult gear changes or excessive metallic particles in drained oil should be investigated.

Specifications & Recommendations

Specifications / Approvals:

• API GL4
• API GL5
• API MT-1

LIQUI MOLY recommendations:

• DAF / Eaton
• MAN M 3343 Type M
• Scania STO 1:0
• ZF TE-ML 02B / 08 / 16B / 17B / 19B

Key Features

• Semi-synthetic
• SAE 75W-90 gear oil
• GL4/GL5 Total Drive Line formulation
• Excellent wear protection
• Outstanding viscosity stability
• Helps reduce frictional losses
• Supports smooth gear shifting
• High resistance to ageing
• Suitable for compatible manual and differential transmissions

Porsche Compatibility & Installation

Suitable for Porsche gearbox or differential applications only where the manufacturer's required lubricant specification matches GL4/GL5 SAE 75W-90.

Although LIQUI MOLY specifies use in certain limited-slip differential applications, compatibility must be confirmed before use.

Always follow the vehicle manufacturer's filling quantities and service instructions.

LIQUI MOLY GL4/GL5 Gear Oils & Porsche Transmission Lubricants

LIQUI MOLY Hypoid Gear Oil TDL SAE 75W-90 provides versatile lubrication for compatible manual transmissions, auxiliary gearboxes and differentials.

Its semi-synthetic formulation delivers excellent protection against wear and reliable performance across varying temperatures.

Available in 1-litre and 20-litre containers, it is suitable for individual servicing and professional workshop maintenance.