Oil Filler Cap 75-79

OVERVIEW

When it comes to maintaining the integrity of your air-cooled engine''s oiling system, no detail is too small, and this Oil Filler Cap for 1975 through 1979 Volkswagen models is a prime example of a small part with a big job. For enthusiasts running the later fuel-injected Type 2 Buses, late Beetles, or Type 4 engines, the oil filler cap is far more than just a simple lid to prevent oil splash; it is a critical component of the closed-loop crankcase ventilation system. A compromised capwhether it is physically cracked from decades of extreme heat cycles or suffering from a flattened, brittle sealcan introduce unmetered air into the intake tract on fuel-injected models. This vacuum leak leads to erratic idling, "hunting" RPMs, and a lean-running condition that can cause your cylinder head temperatures to skyrocket. Replacing your old, weathered cap with this high-quality reproduction ensures that your engine stays sealed, your vacuum remains constant, and your oil stays exactly where it belongs: inside the case.

Crafted from high-density, heat-resistant polymer, this cap is engineered to withstand the punishing environment of a rear-engine Volkswagen engine bay. Foreign Parts Distributors (FPD) has manufactured this unit to meet or exceed original equipment specifications, ensuring that the threading and the internal seal seat perfectly on your factory oil filler neck without binding. Whether you are performing a concours-level restoration on a late-model Westfalia or simply keeping your daily driver Beetle or Vanagon in peak mechanical shape, this cap provides the peace of mind that comes with a secure, airtight fit. Don''t let a minor vacuum leak at the filler neck lead to poor performance or engine overheating; upgrading to a fresh oil filler cap is one of the simplest and most effective maintenance steps you can take for your classic VW air-cooled power plant.

FITMENT

• VW Type 2 Bus: 1975 - 1979 (2.0L Type 4 Engines)
• VW Vanagon: 1980 - 1983 (Air-Cooled 2.0L Models)
• VW Beetle (Fuel Injected): 1975 - 1979 (Standard and Super Beetle)
• VW Type 181 Thing: 1975 (Late Fuel Injected Models)
• Porsche 914: 1970 - 1976 (1.7L, 1.8L, and 2.0L 4-Cylinder Engines)

SPECS

• Part Number: 021-115-311 (021115311)
• Material: Industrial-Grade High-Temp Thermoplastic
• Seal Material: High-Durometer Oil-Resistant Nitrile Rubber
• Attachment Style: Precision-Molded Screw-In Threads
• Color: Satin Black Finish
• Weight: 0.1 lbs (Ultra-lightweight OEM spec)
• Application: Specifically designed for Fuel Injected (FI) crankcase systems

PRO TIPS FROM THE SHOP

Tip 1: The Vacuum Leak Litmus Test

If your 1975-1979 fuel-injected VW is experiencing a rough or high idle, try this trick: while the engine is running, carefully remove the oil filler cap. On a properly sealed system, the idle should noticeably drop or the engine should even stumble. If removing the cap makes no difference to the engine RPM, you likely already have a major vacuum leak somewhere in the system, and your old oil filler cap or its gasket is a prime suspect. This cap ensures the "closed" part of your crankcase ventilation stays closed, which is essential for the Air Flow Meter (AFM) to accurately measure the air entering the engine.

Tip 2: Lubricate the Gasket for a Better Seal

Before you screw your new oil filler