LIQUI MOLY Pro-Line Oil Leak Stop 1ltr  ›  LM5182

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.