Billet Oil Filler Extension Cap, Grooved

OVERVIEW

Upgrade your air-cooled Volkswagen''s engine bay with the precision-engineered EMPI Billet Oil Filler Extension Cap. Designed for the enthusiast who demands both form and function, this grooved billet cap is the ultimate replacement for standard, uninspired oil filler lids. Crafted from high-grade 6061-T6 aluminum, this cap is specifically engineered to fit all Latest Rage and EMPI screw-on oil filler extensions. The striking polished finish provides a custom show-quality look that resists the high-heat environment of a VW engine compartment, while the grooved, knurled perimeter ensures that you can always get a firm grip, even when your hands are slick with oil during a routine maintenance check.

Beyond its aesthetic appeal, this billet oil filler cap is built to last a lifetime, unlike factory plastic or stamped steel versions that can warp, crack, or leak over time. When you are running a high-performance Type 1 or Type 2 engine, crankcase pressure management and a secure seal are vital to preventing oil spray and keeping your cooling fins clean. This cap provides a rock-solid seal that integrates perfectly with your existing extension, ensuring that your oil stays exactly where it belongsinside the engine. Whether you are building a trophy-winning show bug, a rugged off-road rail, or a daily driver that deserves a bit of "engine jewelry," the EMPI AC115540C is the professional choice for a clean and reliable setup.

FITMENT

This billet oil filler cap is designed to fit screw-on oil filler extensions from EMPI and Latest Rage. It is compatible with a wide range of air-cooled VW applications, provided the vehicle is equipped with the appropriate screw-on extension base:

• Volkswagen Type 1: Beetle and Super Beetle (1950-1979)
• Volkswagen Type 2: Bus, Transporter, Kombi (1950-1971)
• Volkswagen Type 3: Fastback, Squareback, Notchback (1961-1973)
• Volkswagen Karmann Ghia: All Years (1955-1974)
• Volkswagen Thing (Type 181): All Years (1973-1974)
• Custom Applications: Dune Buggies, Sand Rails, Trikes, and Baja Bugs utilizing Type 1 upright cooling configurations.

SPECS

This high-quality component is manufactured to strict tolerances to ensure a perfect fit and long-lasting durability in the harshest engine environments.

• Manufacturer: EMPI
• Part Number: AC115540C
• Material: CNC-Machined 6061-T6 Billet Aluminum
• Finish: Polished Aluminum
• Grip Style: Deep Grooved / Knurled Edges for Maximum Torque
• Compatibility: Fits EMPI and Latest Rage Screw-On Filler Extensions
• Weight: Approximately 0.23 lbs
• Internal Threading: Precision machined to match aftermarket extension neck pitches
• Seal: Designed for use with standard high-temp O-rings (check your extension base for seal requirements)

PRO TIPS

1. Avoid Over-Tightening with Tools

The beauty of the knurled, grooved design is that it is specifically crafted for hand-tightening. You should never need to use pliers or a wrench to secure this cap. Over-tightening with metal tools can mar the beautiful polished finish of the billet aluminum and may cause the O-ring seal to flatten or tear. A firm hand-turn is all that is required to create a leak-proof seal on your filler extension. If you find the cap is difficult to remove later, wait for the engine to cool down, as thermal expansion can make the threads tighter when the engine is at operating temperature.

2. Inspect the O-Ring Regularly

While the billet cap itself is nearly indestructible, the rubber O-ring inside the filler extension base is a wear item. Every time you remove the cap to add oil, take a quick second to inspect the seal for cracks, hardening, or flattening. A dry or damaged O-ring is the primary cause of oil seepage around the filler neck. We recommend applying a very thin film of fresh engine oil to the seal before reinstalling the cap; this prevents the rubber from sticking to the aluminum and ensures a more consistent seal every time you close it up.

3. Maintain the Polished Shine

Because this cap is made from genuine billet aluminum, it can oxidize slightly over time due to heat cycles and environmental exposure. To keep it looking like it just came out of the box, use a high-quality aluminum polish once or twice a season. Applying a small amount of polish with a microfiber cloth will remove any dullness and restore that deep, mirror-like reflection. This is especially important for show cars where the engine bay is a focal point. Keeping the grooves clean of dust and old oil will also ensure you always have the best possible grip when it comes time for an oil change.