Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for any of the following conditions:

A crankcase overfill can cause oil to be forced through the positive crankcase ventilation (PCV) system.
An outside source that has allowed oil or fuel to enter the air induction system.
An aftermarket performance kit using an external fuel source.