Billet Oil Fill Tube Cap - Clear Anodized

Features:

• CNC machined from billet aluminum
• Clear anodized finish for corrosion resistance
• Direct OEM replacement cap, not a cover
• Includes o-ring for leak-free seal
• Machined cam lock for secure fitment
• Engraved Wehrli Custom logo underneath
• Compatible with Duramax and LS engines
• Matches other WCFab billet engine caps
• Quick and easy installation
• Made in the USA

Add A Sleek Look to your Engine Bay

If you're the kind of truck owner who appreciates the details under the hood as much as performance out on the road, the Wehrli Billet Oil Fill Tube Cap is a small but impactful upgrade worth your attention. Designed as a direct replacement for the factory plastic oil cap on 2001–2026 Silverado and Sierra 2500HD/3500HD trucks with the 6.6L Duramax, this piece adds both style and strength to an often-overlooked component. Unlike flimsy plastic caps that can wear out over time, this is a CNC-machined billet aluminum cap built for long-term durability. The clear anodized finish adds corrosion resistance while keeping the look clean and sharp. It’s a complete cap, not just a dress-up cover, and it’s engineered to seal tight with a precision-machined cam lock engagement and a high-quality o-ring seal to ensure leak-free performance. What’s more, this cap pairs perfectly with other Wehrli billet pieces like their coolant tank and brake reservoir caps, letting you give your engine bay a cohesive, custom touch. Whether you're popping the hood at a show or just wrenching in the garage, that extra detail stands out.

Fitment: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax

Direct replacement for the following GM OEM model numbers: 97350955, 97216410, 12573341, 12677347

Also compatible with 2.8L LWN Duramax and the following GM LS gasoline engines:

• 4.8L V8 - LR4, LY2, L20
• 5.3L V8 - LC9, LH6, LH8, LH9, LMF, LM4, LM7, LY5, LMG, LS4, L33, L59
• 5.7L V8 - LS1, LS6
• 6.0L V8 - LQ4, LQ9, LS2, L76, L98, L77, LY6, L96, LFA, LZ1
• 6.2L V8 - LS3, LS9, LSA, L92, L99 
• 7.0L V8 - LS7