For 1990-2009 cars

# DIESEL WITH STUCK PISTON RINGS LOW COMPRESSION EXCESS.BLOWBY

IF STUCK PISTON RINGS ARE SUSPECTED TO BE THE CAUSE OF EXCESSIVE OIL CONSUMPTION, LOW COMPRESSION AND EXCESSIVE BLOWBY ON A DIESEL ENGINE, THE FOLLOWING PROCEDURE MAY BE AN EFFECTIVE CORRECTION: 1. REMOVE THE FLOW PLUGS FROM ALL CYLINDERS. 2. EQUALLY DIVIDE THE CONTENTS OF ONE (1) CAN OF TOP ENGINE CLEANER, P/N 1050002, INTO EACH CYLINDER. ALLOW THE ENGINE TO SOAK FOR 24 HOURS. 3. CRANK THE ENGINE WITH THE GLOW PLUGS REMOVE TO EXPELL THE TOP ENGINE CLEANER. 4. REINSTALL THE GLOW PLUGS AND START THE ENGINE.

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.