Product Description
Enhance the appearance and durability of your Duramax engine bay with the WEHRLI CUSTOM FAB WCF100442 BILLET OIL FILL CAP – CLEAR ANODIZED. Precision CNC-machined from high-grade billet aluminum, this premium oil fill cap replaces the factory plastic cap with a durable and visually striking upgrade designed specifically for GM Duramax engines.
Manufactured by Wehrli Custom Fabrication, this billet cap features a sleek clear anodized finish that protects against corrosion, heat, and chemical exposure while maintaining a clean performance appearance. The precision machined threads ensure a secure seal while adding a subtle yet high-end detail to any Duramax engine bay.
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Key Features
- CNC machined billet aluminum construction
- Clear anodized corrosion-resistant finish
- Direct replacement for factory Duramax oil fill cap
- Precision threads for secure sealing
- Improves engine bay appearance
- Designed and manufactured by Wehrli Custom Fabrication
Fitment
- 2001-2004 GM Silverado / Sierra 2500HD & 3500HD 6.6L Duramax LB7
- 2004.5-2005 GM Silverado / Sierra 2500HD & 3500HD 6.6L Duramax LLY
- 2006-2007 GM Silverado / Sierra 2500HD & 3500HD 6.6L Duramax LBZ
- 2007.5-2010 GM Silverado / Sierra 2500HD & 3500HD 6.6L Duramax LMM
- 2011-2016 GM Silverado / Sierra 2500HD & 3500HD 6.6L Duramax LML
- 2017-Present GM Silverado / Sierra 2500HD & 3500HD 6.6L Duramax L5P
Frequently Asked Questions
Does this cap replace the factory oil fill cap?
Yes. The Wehrli WCF100442 billet cap is a direct replacement for the OEM plastic oil fill cap found on all Duramax engines from 2001-present.
What material is the cap made from?
The cap is CNC machined from high-grade billet aluminum for superior strength and durability compared to the factory plastic cap.
Will the anodized finish fade or discolor?
The clear anodized finish is designed to resist corrosion, heat, and engine bay chemicals while maintaining a clean appearance.
Is installation difficult?
No installation tools are required. Simply remove the factory oil cap and thread the Wehrli billet cap into place.
Does this improve engine performance?
This product is primarily an engine bay upgrade that improves durability and aesthetics rather than performance.
Specifications for WEHRLI CUSTOM FAB WCF100442
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100442 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | 0.5 lbs |
| Package Dimensions | 4 x 4 x 2 inches |
| Shipping Method | UPS / USPS / FedEx |
| Prop 65 Warning | This product may contain chemicals known to the State of California to cause cancer or reproductive harm. For more information visit https://www.P65Warnings.ca.gov |
