For 1990-2009 cars

# ENGINE COOLANT USAGE ANTI-FREEZE SPECS CHANGE

GENERAL MOTORS OF CANADA HAS IN PAST MODEL YEARS RECOMMENDED USE OF ETHYLENE GLYCOL BASE ANTI-FREEZE THAT MEETS GM SPECIFICATION 1899-M. THIS RECOMMENDATION HAS CHANGED FOR 1982 VEHICLES WHICH ARE FACTORY FILLED WITH COOLANT WHICH MEETS GM 1825-M SPECIFICATIONS. IT IS REQUIRED THAT ANY ADDITIONS OF COOLANT TO THESE VEHICLES BE DONE WITH GM 1825-M. THIS CHANGE WAS NECESSARY DUE TO THE USE OF ALUMINUM CYLINDER HEADS ON SOME ENGINES IN 1982 WHICH REQUIRED A DIFFERENT FORMULATION OF ANTI-FREEZE TO PREVENT CORROSION. THIS ANTI-FREEZE IS AVAILABLE FROM WDDGM IN 1 LITRE CAN P/N 993088, 4 LITRE BOTTLE P/N 993089 AND 205 LITRE DRUM P/N 993090. THIS NEW COOLANT MAY BE ADDED TO SYSTEMS WHICH CONTAIN ANTI-FREEZE MEETING THE GM 1899-M SPECIFICATIONS WITH NO ADVERSE EFFECT, BUT IT IS RECOMMENDED THAT WHEN A COMPLETE DRAINING OF A COOLING SYSTEM IS PERFORMED SUCH AS FOR ENGINE REPAIR, THAT IT BE REFILLED WITH ONE SOURCE RATHER THAN MIXING OLD ANTI-FREEZE WITH NEW AS THERE MAY BE SLIGHT DIFFERENCES IN THEIR CHEMICAL PROPERTIES THAT COULD AFECT THEIR OVERALL PERFORMANCE. PROCEDURES FOR MIXING ANTI-FREEZE TO WATER TO OBTAIN THE REQUIRED PROTECTION LEVEL ARE UNCHANGED.

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.