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Porsche 993 (911) (1994-1998) 993 (911) C4S 1994-97 Engine Rebuild Parts Oil System Parts

Filler Neck Parts

Filler Neck Parts

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DISPLAYING 1 to 7 (of 7 products)
Oil Filler Neck Bellow. Porsche 993 - 99320736350
4
Oil Filler Neck Bellow. Porsche 993
Special Order item
99320736350
Product Information
Product Information
Oil Filler Neck Bellow.

Fits:
Porsche 993 1994-98

Click 'Zoom in' for large parts diagram
Diagram ref no 61

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99320736350
99320736350

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Oil Filler Neck Hose. Porsche 993 - 99320721202
4
Oil Filler Neck Hose. Porsche 993
Special Order item
99320721202
Product Information
Product Information
Oil Filler Neck Hose. (without #25 please order this item if required 99320721261)



Fits:
Porsche 993 1994-98

Click 'Zoom in' for large parts diagram
Diagram ref no 21



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99320721202
99320721202

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Oil filler neck. Porsche 993 - 99320736104
3
Oil filler neck. Porsche 993
Special Order item
99320736104
Product Information
Product Information
Oil filler neck.

Fits:
Porsche 993 1994-98

Click 'Zoom in' for large parts diagram
Diagram ref no 24

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99320736104
99320736104

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Oil Tank Cap Bayonet fitting type Porsche 911 / 993 - 91110707202, 91110707203, 91110707204
3
Oil Tank Cap Bayonet fitting type Porsche 911 / 993
Special Order item
91110707204
Product Information
Product Information
Oil Tank Cap Bayonet fitting type

Fits:
Porsche 911 1973-86*
*fit oil tank 9111070061, 91110700620, 91110700630

Porsche 993 1994-98

Related reference numbers
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91110707204
91110707202
91110707203
91110707204

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Oil Tank Cap Bayonet fitting type. Porsche 911 / 993 - 91110707202, 91110707203, 91110700630/1, 91110707204 - 1613601000, P1402
3
Oil Tank Cap Bayonet fitting type. Porsche 911 / 993
91110707204/1
Product Information
Product Information
Oil Tank Cap Bayonet Fitting Type.

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
91110707202
91110707203
91110700630
91110707204

The product you are viewing cross references to these numbers
Oil tank cap gasket. Porsche 911 / 993 - 93010727201, 90120127200 - COL113103
2
Oil tank cap gasket. Porsche 911 / 993
Special Order item
93010727201
Product Information
Product Information
Oil tank cap gasket.

Fits:
Porsche 911 1978-86
Porsche 993 1994-98

Click 'Zoom in' for large parts diagram.
Diagram ref no 12

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

93010727201
93010727201
90120127200

The product you are viewing cross references to these numbers
Oil tank cap gasket. Porsche 911 / 993 / 914 / 356 - 93010727201, 90120127200 - COL11.3.103, COL113103
2
Oil tank cap gasket. Porsche 911 / 993 / 914 / 356
93010727201/1
Product Information
Product Information
Oil tank cap gasket.

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
93010727201
90120127200

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DISPLAYING 1 to 7 (of 7 products)
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About Filler Neck Parts

Engine Oil Filler Neck Parts – Reliable Oil Access for Porsche Engines

The engine oil filler neck is a crucial component in your Porsche’s lubrication system, allowing for safe and efficient oil refilling while ensuring a proper seal to prevent leaks, vapour escape, or contamination. This part connects the oil filler cap to the main crankcase or reservoir, maintaining pressure integrity throughout the engine’s oil system.

At Design911, we supply a complete selection of oil filler necks, caps, seals, and connecting pipes designed specifically for Porsche vehicles. Crafted from high-quality, heat- and oil-resistant materials, these components deliver long-lasting durability, perfect fitment, and superior performance under demanding driving conditions.

Whether you’re maintaining a modern 992 or restoring a classic air-cooled 911, our oil filler parts provide dependable sealing, efficient oil flow, and long-term reliability.

What Do Oil Filler Neck Parts Do?

The oil filler neck system provides a controlled entry point for adding engine oil while maintaining the closed integrity of the lubrication circuit.

Core Functions:

  • Allows efficient oil refilling without contamination or spillage.
  • Maintains proper oil system pressure by ensuring an airtight seal.
  • Connects filler cap to oil reservoir or crankcase for secure delivery.
  • Prevents debris or moisture from entering the engine oil system.

A properly functioning oil filler neck ensures clean, efficient oil servicing and protects your Porsche’s engine from contaminants or pressure imbalance.

Why Do Oil Filler Neck Parts Fail?

Due to constant exposure to oil, heat, and vibration, filler neck parts can degrade over time, leading to leaks or improper sealing.

Common Causes of Failure Include:

  • Cracked or brittle filler pipes caused by age or heat exposure.
  • Worn or damaged seals and O-rings, leading to oil vapour leaks.
  • Oil residue build-up, causing clogging or poor fitment.
  • Loose or corroded fittings from repeated use.
  • Improper installation leading to pressure loss or leaks.

Signs of failure may include oil odours, visible leaks, loose filler caps, or vacuum imbalance, all of which can reduce performance and cause maintenance issues if left unchecked.

Why Replace with Precision-Engineered Oil Filler Neck Components?

Replacing worn or damaged oil filler parts ensures proper oil pressure, clean oil flow, and reliable engine servicing. Our high-quality, direct-fit components are built to resist heat, corrosion, and oil degradation, maintaining system integrity even under high-performance conditions.

Key Benefits:

  • Restores airtight sealing and proper oil system pressure.
  • Prevents leaks and oil contamination.
  • Improves service convenience and reliability.
  • Constructed from high-strength, oil-resistant materials.
  • Direct-fit compatibility for classic and modern Porsche engines.
  • Perfect for regular maintenance or engine rebuilds.

Replacing the filler neck and related parts not only prevents oil loss but also helps maintain clean, efficient engine operation.

Highlights:

  • Precision-engineered oil filler necks and components for Porsche engines.
  • Durable, corrosion-resistant materials for long-term reliability.
  • Direct-fit replacements for Porsche 911, Boxster, Cayman, Cayenne, Panamera and more
  • Ensures proper oil refilling and system sealing. Reduces risk of leaks, contamination, and vapour loss.
  • Ideal for maintenance, rebuilds, or restoration projects.

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