Filler Neck Parts

Oil Filler Cap and O-ring

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 968 1992-95
Porsche 924S 1986-88
Porsche 944 2.7L 1989
Porsche 944 S2 3.0L 1989-91
Porsche 944 2.5L Turbo 1986-91
Porsche 944 2.5L Turbo S 1987-88
Porsche 928 S4 / GT / GTS 1987-95

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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Related, superseded, cross reference or alternative numbers for comparison.

94410709101

The product you are viewing cross references to these numbers

Oil Filler Cap Seal 

High-quality replacement oil filler cap seal designed for a wide range of Porsche models.

This gasket fits within the oil filler cap, ensuring a tight and secure seal to prevent oil leaks and protect the engine from contamination. It is an essential component for maintaining proper engine sealing and cleanliness.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• 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 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• 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 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 12

Manufactured to OEM specifications, this seal provides precise fitment and reliable long-term performance—ideal for routine maintenance or resolving oil seepage issues.

Key Features

• Direct replacement oil filler cap seal
• Suitable for multiple Porsche models
• Ensures secure sealing of oil filler cap
• OEM-style fit and performance
• Durable material resistant to heat and oil
• Ideal for maintenance and leak prevention

Function and Purpose

This seal ensures a proper closure of the oil filler cap.

It helps to:

• Prevent engine oil leaks
• Maintain engine cleanliness
• Protect against dirt and contamination
• Support consistent engine performance

Why Replace Your Oil Filler Cap Seal

Over time, seals can degrade due to heat and oil exposure.

Common issues include:

• Oil seepage around the filler cap
• Hardened or cracked seal material
• Reduced sealing effectiveness
• Increased risk of contamination

Replacing the seal restores proper engine sealing and prevents leaks.

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Related, superseded, cross reference or alternative numbers for comparison.

99970184641

The product you are viewing cross references to these numbers

Oil Filler Cap.
The OE MATCH Oil Filler Cap is a replacement engine oil filler cap designed for compatible Porsche applications. Installed at the engine's oil filling point, the cap closes and seals the opening after engine oil has been added.

Fits:

• Porsche 911 SC 1974-83 SPORTMATIC ONLY
• Porsche 911 Turbo (3.3L) 09/1977-07/1989
• Porsche 964 1989-94
• Porsche 968 1992-95
• Porsche 924S 1986-88
• Porsche 944 2.7L 1989
• Porsche 944 S2 3.0L 1989-91
• Porsche 944 2.5L Turbo 1986-91
• Porsche 944 2.5L Turbo S 1987-88
• Porsche 928 S4 / GT / GTS 1987-95

Although relatively simple, the oil filler cap performs an important sealing function. A correctly fitted cap helps prevent engine oil from escaping while protecting the lubrication system from dirt, moisture and other external contamination.  

What This Product Does:
The oil filler cap seals the opening used when adding engine oil.

Once installed correctly, it helps:

• Close the engine oil filling point
• Prevent oil from splashing or escaping
• Reduce the risk of dirt entering the engine
• Reduce moisture and external contamination
• Maintain the intended sealing of the lubrication system
• Keep the engine bay cleaner
• Provide convenient access during oil servicing

The cap must fit securely and its sealing surface must remain in good condition.

Symptoms Of Wear Or Failure:
Oil filler caps are exposed to engine heat, oil vapour and repeated removal during servicing. Over time, the cap or its sealing components can deteriorate.

Common symptoms include:

• Oil residue around the filler opening
• Oil leaking or misting around the cap
• Oil staining nearby engine components
• Cap becoming loose
• Cap no longer tightening securely
• Cracked or damaged cap
• Hardened or deteriorated sealing surface
• Damaged threads or retaining features
• Cap becoming difficult to remove or install
• Visible deformation
• Missing oil filler cap

Any persistent oil leakage around the filler opening should be investigated rather than simply cleaned away.

Why Replacement Matters:
Replacing a worn or damaged oil filler cap helps maintain the integrity and cleanliness of the engine lubrication system.

A new cap can help:

• Restore a secure seal
• Prevent oil leakage around the filler opening
• Reduce oil mist in the engine compartment
• Protect against dirt and moisture
• Keep surrounding engine components cleaner
• Replace cracked or deteriorated material
• Restore secure engagement with the filler opening
• Maintain reliable access for routine oil servicing

A missing or severely damaged filler cap should be replaced promptly.

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

94410709101

The product you are viewing cross references to these numbers

Oil Filler Tube Neck. 

The Genuine Porsche Oil Filler Tube Neck 91110772611 is an original equipment replacement component designed for the engine oil filling system of classic Porsche 911 models.

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  

Diagram Ref No 12

Manufactured to Porsche's original specifications, this oil filler neck forms part of the engine's lubrication system, providing a secure and accessible connection for adding engine oil to the oil reservoir.

Also known as an oil filler neck or oil filler tube connection, this component helps maintain the correct oil filling arrangement while supporting proper sealing around the oil filler assembly.

The filler neck provides an important interface between the oil filling opening and the associated oil tank components, helping ensure engine oil can be added safely and efficiently during routine servicing.

Over time, exposure to engine heat, oil residue, vibration and general ageing can cause original filler neck components or their associated seals to deteriorate. Damage or poor sealing may result in oil seepage, unwanted oil vapour smells or contamination around the filling area.

The Genuine Porsche Oil Filler Tube Neck provides a practical original equipment replacement solution for restoring the integrity and functionality of the oil filling system.

Ideal for routine engine maintenance, oil tank refurbishment and classic Porsche restoration projects, this component helps preserve the original configuration and dependable operation of the vehicle's lubrication system.

What This Product Does:
The oil filler tube neck provides an accessible passage for adding engine oil into the lubrication system, forming part of the connection between the oil filler opening and the oil reservoir.

It works alongside the oil filler cap, adjoining filler tube and associated sealing components to maintain a secure oil filling arrangement.

Its key functions include:

• Engine Oil Filling: Provides a designated opening and passage for adding engine oil during routine servicing.
• Oil Filler Connection: Forms part of the connection between the oil filler opening and the associated oil reservoir.
• Secure Oil Filling Arrangement: Helps maintain correct positioning of the oil filler components.
• Oil Leak Prevention: Works with the associated seals and connections to reduce the risk of oil escaping around the filler assembly.
• Oil Vapour Containment: Supports the sealed arrangement of the oil reservoir and helps limit unwanted oil vapour escape.
• Contamination Protection: Works with the oil filler cap to help prevent dirt, dust and moisture entering the lubrication system.
• Convenient Maintenance: Provides accessible oil filling during routine engine servicing and oil changes.
• Oil System Integrity: Helps maintain the intended connection and sealing arrangement of the engine oil reservoir.
• Original Equipment Fitment: Maintains Porsche's specified oil filler component configuration.
• Restoration Support: Provides a genuine replacement for damaged or deteriorated original filler neck components.

Symptoms Of Wear Or Failure:
Over time, heat exposure, engine vibration, repeated servicing and general ageing can cause the oil filler tube neck and its surrounding components to deteriorate.

Common signs include:

• Visible Oil Leaks: Oil collecting around the filler neck or adjoining connection may indicate damage or ineffective sealing.
• Oil Seepage Around the Filler Assembly: Small amounts of oil appearing around the neck may suggest a worn seal, loose connection or damaged component.
• Cracked or Damaged Filler Neck: Visible cracks, fractures or deterioration may compromise the integrity of the oil filling assembly.
• Loose Filler Neck Connection: Damaged mounting or retaining points can cause unwanted movement around the oil filler opening.
• Oil Vapour Smell: A damaged or poorly sealed filler arrangement may allow oil vapours to escape, producing an unpleasant smell.
• Damaged Sealing Surfaces: Wear, corrosion or deformation around the contact surfaces may prevent effective sealing.
• Oil Residue Accumulation: Excessive oil deposits around the filler area may indicate leakage or previous oil spillage.
• Difficulty Securing the Oil Filler Cap: Damage or deformation around the filler opening may prevent the cap from fitting correctly.
• Corrosion or Surface Deterioration: Moisture exposure and ageing can cause corrosion on susceptible metal components.
• Deformed or Damaged Neck: Previous repairs, accidental impacts or excessive force during servicing may affect the filler neck's original shape.
• Contamination Around the Opening: A damaged or poorly fitting assembly may allow dirt and moisture to collect around the oil filling point.
• Damaged Associated Seals: Hardened, flattened or deteriorated gaskets may cause oil seepage around the filler connection.

Why Replacement Matters:

• Replacing a damaged or deteriorated oil filler tube neck is important for maintaining the integrity, cleanliness and reliable operation of your classic Porsche's engine lubrication system.
• The oil filling system provides an essential access point for replenishing engine oil during routine maintenance. The filler neck must remain correctly positioned and securely connected to the associated oil reservoir components to allow oil to be added without unnecessary leakage or contamination.
• If the filler neck becomes cracked, damaged or incorrectly sealed, oil may escape around its mounting points or adjoining connections.
• Oil seepage can cause unwanted deposits around the engine compartment, attract dirt and potentially create unpleasant oil vapour smells.
• Maintaining a correctly sealed oil filling arrangement also helps prevent dust, moisture and other contaminants from entering the lubrication system.
• Contaminated engine oil can contribute to increased wear of internal engine components, making it important to maintain the condition of the filler opening, cap and associated connections.
• A correctly fitted Genuine Porsche replacement neck helps restore the original oil filling configuration and supports dependable operation during routine servicing.
• Replacing a damaged filler neck can also help prevent additional stress on the associated filler hose, oil tank connections and sealing components.
• For classic Porsche owners, maintaining the original equipment arrangement is particularly important when carrying out engine refurbishment, oil tank repairs or detailed restoration work.
• The genuine Porsche component helps preserve the factory-style appearance and fitment of the oil filling assembly without unnecessary modifications.
• During replacement, inspecting the adjoining oil filler cap, seals and connecting components provides an opportunity to address other age-related deterioration before it develops into a more significant problem.
• The Genuine Porsche Oil Filler Tube Neck 91110772611 provides an original equipment replacement solution designed to maintain secure oil filling, reduce leakage risks and preserve the long-term condition of the engine lubrication system.

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

91110772611

The product you are viewing cross references to these numbers

Oil tank cap gasket.

Fits:
Porsche 911 1984 - 1989
Porsche 964 1989 - 1994
Porsche 924S 1986 - 1988
Porsche 928 1987 - 1995
Porsche 944 1985 - 1991
Porsche 968 1992 - 1995

Diagram ref no 12

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

99970184641

The product you are viewing cross references to these numbers

Rennline RSR billet oil cap screw style. 

Fits:
Porsche 911 - 1978 to 1989
Porsche 964 - 1989 to 1994
Porsche 968 - 1992 to 1995
Porsche 924S - 1986 to 1988
Porsche 944 2.5ltr - 1982 to 1991
Porsche 944 2.7ltr - 1989
Porsche 944 S2 3.0ltr - 1989 to 1991
Porsche 944 2.5ltr Turbo 1986-91
Porsche 944 2.5LTurbo S - 1987 to 1988
Porsche 928 S4 / GT / GTS - 1987 to 1995

Product Description

Is your 30+ year old oil cap showing its age? 

This oil cap will stand up to the elements thanks to the anodized finish on this full-billet aluminum oil cap. The added RSR styling to our oil cap is the finishing touch to your Porsches engine bay.

• Constructed from Aircraft Grade Aluminum
• Anodized finish available in both clear or black
• O-ring pre-installed and ready for use

Diagram ref no 11

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

M113

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