DIESEL ENG. MISS/EXHAUST SMOKE AT HIGHWAY SPEEDS

AN ENGINE MISS FOLLOWED BY A PUFF OF BLUE SMOKE OUT THE EXHAUST MAY BE CAUSED BY ENGINE OIL LEAKING INTO THE INTAKE AREA OF CYLINDER HEAD. THE PIPE-THREAD PLUGS THAT COVER THE UPPER TOREX HEAD BOLTS MAY BE THE SOURCE OF AN OIL LEAK IF NOT FULLY SEATED.

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.