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Filler Neck Parts
By OE Match
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Oil Filler Cap with Seal
High-quality replacement oil filler cap designed for Porsche 928 models with the rotary knob made of anodized aluminum.
This cap seals the engine oil filler neck, preventing oil
leaks and contamination while maintaining correct pressure within the engine. A
secure and properly functioning oil cap is essential for protecting engine
components and ensuring efficient lubrication.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Diagram ref no 25
Manufactured to OEM specifications, this oil filler cap offers precise fitment and durability, making it ideal for routine maintenance, repair, or restoration of Porsche 928 engines.
Key Features
• Direct replacement oil filler cap
• Suitable for Porsche 928 models
• Ensures secure sealing of the oil system
• Prevents oil leaks and contamination
• OEM-style fit and finish
• Durable construction for long-term reliability
Function and Purpose
This oil filler cap is a critical component of the engine lubrication system.
It helps to:
• Seal the oil filler opening securely
• Prevent oil leakage during operation
• Protect engine oil from contaminants
• Maintain proper crankcase pressure
Why Replace Your Oil Filler Cap
Over time, oil caps can wear or degrade.
Common issues include:
• Cracked or worn seals
• Oil leaks around the filler neck
• Loose or damaged cap threads
• Contamination entering the engine
Replacing the cap ensures proper sealing and engine protection.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92819971003
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.
