GM Service Manual Online
For 1990-2009 cars only

ENGINE COLOR CHANGE FOR CHEVROLET PRODUCTION VEHICLES

All gasoline engines and the 6.2L diesel engine used in 1983 production Chevrolet vehicles will be painted black.

This change is part of the engine compartment clean-up program effective SOP 1983.

The Oldsmobile 4.3L and 5.7L diesel engines will retain the blue color for 1983 production.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.