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Filler Neck Parts
By OE Match
- 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
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:
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Related, superseded, cross reference or alternative numbers for comparison.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
- 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 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 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
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
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- 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
The OE MATCH Oil Tank Cap – Bayonet Fitting Type is a replacement engine oil tank filler cap designed for selected air-cooled Porsche 911 and Porsche 993 models equipped with the corresponding dry-sump lubrication system.
Fits:Porsche 911 1978-86*
*fit oil tank 9111070061, 91110700620, 91110707203
Porsche 911 1970-98
Manufactured to match the original equipment fitting arrangement, this cap provides a secure closure for the external engine oil tank's filler opening, helping protect the lubrication system from dirt, dust, moisture and other environmental contaminants.
Unlike conventional engines that store most of their lubricating oil in a sump beneath the crankshaft, the air-cooled Porsche 911 uses a dry-sump lubrication system with a separate oil reservoir.
This external oil tank stores the engine oil and forms an important part of the circulation system that supplies lubrication to the engine's moving components.
The oil tank filler cap allows access to the reservoir when topping up engine oil or carrying out routine servicing.
Its bayonet-style fastening mechanism is designed to engage with the corresponding oil tank filler neck, providing a secure and convenient closure.
The correct fitting and condition of the oil tank cap are important for maintaining a clean, properly enclosed oil reservoir.
Over time, an original oil tank cap may deteriorate due to repeated removal, exposure to heat, oil residue, vibration and natural ageing. The sealing surface may become damaged, while the locking tabs or bayonet mechanism may become worn or distorted.
A loose, damaged or incorrectly fitting oil tank cap may allow oil mist or residue to escape around the filler neck and permit contaminants to enter the tank.
Replacing a deteriorated cap with the OE MATCH Oil Tank Cap 91110707204/1 helps restore secure closure of the oil filler opening, maintain the cleanliness of the lubrication system and preserve the original Porsche oil tank arrangement.
Ideal for routine servicing, oil tank refurbishment, engine bay restoration and classic Porsche maintenance.
What This Product Does:
The oil tank cap provides a removable closure for the engine oil reservoir's filler opening.
Its primary functions include:
- Closes the Oil Filler Opening: Provides a secure cover for the external engine oil tank.
- Helps Prevent Contamination: Reduces the entry of dust, dirt and debris during normal vehicle operation.
- Reduces Moisture Ingress: Helps prevent rainwater, splashes and other external moisture from entering through the filler opening.
- Provides Secure Bayonet Engagement: Uses the corresponding bayonet-style locking mechanism to retain the cap on the filler neck.
- Helps Contain Oil Mist: Reduces the escape of oil mist and minor oil residue around the filler opening.
- Maintains Oil Tank Cleanliness: Helps protect the oil stored within the dry-sump lubrication reservoir.
- Supports Routine Oil Servicing: Can be removed to allow engine oil to be added through the correct filler point.
- Maintains Original Equipment Fitment: Preserves the factory-style oil tank cap arrangement.
- Protects the Filler Neck: Covers the opening when oil is not being added.
- Supports Lubrication System Maintenance: Helps maintain a clean and properly closed oil reservoir.
Symptoms Of Wear Or Failure:
The oil tank filler cap is regularly removed during maintenance and is exposed to heat, engine oil and vibration.
Over time, the locking mechanism and sealing surfaces may deteriorate.
Common symptoms of a worn or failing oil tank cap include:
- Loose-Fitting Cap: The cap may not sit securely on the oil tank filler neck.
- Difficulty Locking the Cap: The bayonet tabs may no longer engage smoothly or correctly.
- Cap Not Remaining Secure: A damaged locking arrangement may allow the cap to loosen.
- Worn Bayonet Tabs: Repeated operation or incorrect installation may wear the retaining surfaces.
- Damaged Sealing Surface: The cap may no longer make proper contact with the filler neck.
- Hardened or Deteriorated Seal: Where a sealing element is fitted, ageing may cause it to become brittle, flattened or damaged.
- Oil Residue Around the Filler Neck: Oil mist or seepage may appear around a cap that is not closing correctly.
- Oil Smell in the Engine Compartment: Oil vapours escaping around the filler opening may produce a noticeable odour.
- Visible Cracks or Deformation: Physical damage may prevent the cap from fitting or locking correctly.
- Corrosion or Deterioration: Age-related damage may affect the cap's locking or contact surfaces.
- Missing Oil Tank Cap: The original cap may have been misplaced during servicing.
- Incorrect Replacement Cap: A cap with the wrong locking arrangement may not fit the oil tank correctly.
- Contamination Around the Filler Opening: Dirt and debris may accumulate where the filler neck is not adequately covered.
Why Replacement Matters:
Replacing a worn, damaged or missing oil tank cap is important for maintaining the cleanliness and correct closure of the dry-sump lubrication system.
- Restores Secure Oil Tank Closure: Replaces a loose or damaged cap with the correct bayonet-style fitting.
- Helps Prevent Dirt Ingress: Protects the oil reservoir against external contamination.
- Reduces Moisture Exposure: Helps prevent water and moisture entering through the filler opening.
- Maintains Oil Cleanliness: Supports the condition of the oil stored within the external reservoir.
- Reduces Oil Mist Escape: Helps contain oil mist and minor seepage at the filler neck where the cap is responsible.
- Supports Reliable Cap Retention: Provides the specified locking engagement for compatible oil tanks.
- Maintains Original Equipment Appearance: Restores the factory-style filler cap arrangement.
- Protects Lubrication System Components: Helps prevent foreign material entering the oil circuit through the filler neck.
- Improves Servicing Convenience: Provides a correctly fitting cap for routine oil top-ups.
- Supports Preventative Maintenance: Addresses wear before the cap becomes insecure or is lost.
- Original Equipment-Style Fitment: Designed to correspond with the specified Porsche bayonet filler arrangement.
- Suitable for Engine Bay Restoration: Helps maintain the original appearance of classic Porsche oil tank installations.
- Cost-Effective Replacement: A relatively simple component that helps protect an important lubrication system.
The external oil tank is a critical part of the dry-sump lubrication system used in air-cooled Porsche engines.
Keeping the oil reservoir properly closed helps prevent foreign material from entering the oil supply.
Dirt, water or other contamination introduced through an open or improperly covered filler neck can affect lubricant cleanliness and may contribute to unwanted wear if it circulates through the engine.
A damaged cap may also allow oil residue to accumulate around the filler opening, making the engine compartment harder to keep clean and potentially obscuring other leaks.
Although replacing the filler cap will not cure unrelated oil leaks or lubrication problems, fitting the correct cap restores an important protective feature of the oil tank.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110707204
The product you are viewing cross references to these numbers
- 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 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Fits:
Porsche 356 B-T6 / C
Porsche 911 1965-86
Porsche 914 1970-76
Porsche 993 1994-98
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010727201
The product you are viewing cross references to these numbers
- 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)
A lockable oil filler cap with beautiful engraved OIL inscription for side filler modification
Fits:
Porsche 911 1973 - 1989
This OE Match side filler oil cap kit is a replacement oil filler cap kit for Porsche 911 models from 1973 to 1989. It is designed for the side oil filler system and helps restore correct sealing, appearance, and function of the external oil filler arrangement.
The side filler oil cap closes and seals the oil filler opening, helping prevent oil vapour, oil mist, dirt, and moisture from entering or escaping the oil tank / filler system. A correctly sealing oil cap is important for maintaining the integrity of the dry-sump oil system used on classic Porsche 911 models.
Functions
• Replaces the side oil filler cap assembly
• Seals the oil filler opening securely
• Helps prevent oil vapour and oil mist escape
• Helps protect the oil system from dirt and moisture entry
• Restores the correct OE-style oil filler appearance
• Supports proper dry-sump oil tank sealing
• OE Match replacement for service, repair, or restoration.
Why Replace This Kit?
Oil filler caps can become worn, loose, corroded, damaged, or lose sealing performance over time. A poor seal may allow oil mist, vapour, dirt, or moisture to pass through the filler area, and can leave the vehicle looking incomplete or incorrect during restoration. Replacing the side filler oil cap kit helps restore secure sealing and the correct classic Porsche finish.
When to Replace This Kit
• The original side filler oil cap is missing or damaged
• The cap does not seal securely
• Oil vapour, oil mist, or residue is visible around the filler area
• The cap is corroded, loose, cracked, or heavily worn
• The oil filler neck or surrounding oil tank components are being serviced
• The vehicle is undergoing Porsche 911 oil system restoration
• The car is being restored to an OE-style appearance.
Where it fits on the car
This kit fits at the side oil filler opening on Porsche 911 models equipped with the relevant oil filler arrangement. It forms part of the oil tank / filler neck system and should be installed according to the factory oil system layout.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
911112103
The product you are viewing cross references to these numbers
OEMatch filler neck parts for Porsche models provide the connection between the engine or oil reservoir and the filler cap, enabling controlled oil refilling while maintaining the lubrication system seal. This collection covers filler necks, caps, seals and connecting pipes suitable for air-cooled and water-cooled Porsche engines, useful for routine maintenance, engine rebuilds and restoration work.
Understanding OEMatch Filler Neck PartsOEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original filler neck parts.
OE (Original Equipment) refers to parts matching original specifications for the filler neck parts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM filler neck parts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
These components form the filler neck assembly and are typically made from heat- and oil-resistant materials, with seals and O-rings that maintain pressure integrity and prevent contamination.
- Restores airtight sealing to prevent oil leaks and vapour loss.
- Supports clean, controlled oil refilling and reduces contamination risk.
- Replaces degraded pipes, seals and caps to maintain system pressure and reliability.
- Heat and vibration cause pipes and hoses to become brittle and crack.
- Seals and O-rings deteriorate from oil exposure and age, allowing vapour leaks.
- Residue and sludge build-up can impede sealing and lead to poor fitment.
Replacing worn filler neck components preserves oil system integrity, prevents leaks that can cause contamination or oil loss, and keeps servicing straightforward. Correct seals and properly formed filler pipes help the crankcase breathe as intended and support consistent engine operation across model years.
Advantages- Parts selected for compatibility with Porsche mounting points and service procedures.
- Materials chosen to resist oil, heat and corrosion for longer service life.
- Suitable for restoration and routine maintenance, covering both classic and modern applications.
