Dorman 42315 Engine Oil Filler Cap

Engine Oil Filler Cap for GM 5W30 Applications

Dorman 42315 is a black plastic engine oil filler cap built to match the fit and function of the original cap on specified vehicles. It features a twist-lock design, oil-resistant construction, and a cap marking for SAE 5W30 applications.

• Direct replacement-style oil filler cap for select GM vehicles
• Twist-lock design for secure engagement
• Black plastic construction
• Oil-resistant material for engine bay use
• Marked with SAE 5W30 on applicable vehicles
• Fits many Chevrolet, GMC, Buick, Cadillac, Pontiac, Hummer, and Oldsmobile models

Fitment and Application Details

Compatible with a wide range of GM platforms, including Fits 2003-2012 Chevrolet Express 1500, N/A; Fits 1999-2009 Chevrolet Silverado 1500, N/A; and Fits 2003-2011 GMC Savana 2500, N/A. This Dorman 42315 oil filler cap also covers applications such as Fits 2006-2011 Buick Lucerne, N/A and Fits 2007-2008 Cadillac Escalade, N/A, all with cap marking for SAE 5W30 where noted.

This part cross-references Anchor 10099 for the same application.

What This Oil Cap Helps Address

• Missing or damaged engine oil filler cap
• Loose or worn twist-lock retention
• Oil cap markings that no longer read clearly
• Oil seepage from a cap that no longer seals properly
• Replacement needs on GM trucks, vans, and SUVs with SAE 5W30-marked caps

Installation Notes and Tips

Verify the cap diameter, twist-lock style, and SAE 5W30 marking before installation. Compare the original cap to Dorman 42315 to confirm the fit on your Chevrolet Silverado, GMC Sierra, or Buick application. Clean the filler neck before installing the cap to help ensure a proper seal.

Quality Assurance

Dorman engineers this engine oil filler cap to match original fit and function for specified vehicles. The oil-resistant plastic construction is designed for dependable everyday engine-bay service.