Have Questions?
-
Guaranteed Fitment
Always the correct part
-
In-House Experts
We know our products
-
-
US Delivery
Free shipping on all orders over $50
Wehrli 2001+ GM Duramax LB7/LLY/LBZ/LMM/LML/L5P Billet Oil Fill Cap - Clear Anodized
Add a premium finishing touch to any GM Duramax diesel engine with the Wehrli Custom Fabrication Billet Oil Fill Cap in Clear Anodized Aluminum, compatible with all 2001+ GM Duramax engines including LB7, LLY, LBZ, LMM, LML, and L5P. This CNC-machined billet aluminum cap replaces the factory plastic oil fill cap with a durable, precision-machined piece that looks as good as it functions.
The clear anodized finish highlights the natural aluminum billet and provides excellent corrosion resistance, keeping the cap looking fresh under the hood for years. A simple, affordable upgrade that instantly elevates the appearance of any Duramax engine bay — perfect for show trucks and daily drivers alike.
Key Features
- Fits: 2001+ GM Duramax — LB7, LLY, LBZ, LMM, LML, and L5P diesel engines
- CNC-machined from billet aluminum — far superior to the factory plastic cap
- Clear anodized finish — natural aluminum look with lasting corrosion resistance
- Direct thread-in replacement — no modifications required
- Seals securely to prevent oil leaks and vapor escape
- Made in the USA by Wehrli Custom Fabrication (WCFab)
- MPN: WCF100442
One of the most affordable and visually impactful upgrades available for your Duramax diesel. The Wehrli billet oil fill cap pairs beautifully with Wehrli valve covers, coolant tanks, and other billet accessories for a unified, high-end engine bay appearance.