1996 Buick Century Owner's Manual

What to UseUse a mixture of one-half clean water (preferablydistilled) and one-half DEX-COOL TM (orange-colored,silicate-free) antifreeze that meets GM Specification6277M, which won’t damage aluminum parts. UseGM Engine Coolant Supplement (sealer) (GM PartNo. 3634621) with any complete coolant change. If youuse this mixture, you don’t need to add anything else.I NOTICE:If you use an improper coolant mix, yourengine could overheat and be badly damaged.The repair cost wouldn’t be covered byourwarranty. Too much water in the mix can freezeand crack the engine, radiator, heater core andother parts.lain water to your cooling systemcan be dangerous. Plain water, or some otherliquid like alcohol, can boil before the propercoolant mix will. Your vehicle’s coolant warningsystem is set for the proper coolant mix. Withplain water or the wrong mix, your engine couldget too hot but you wouldn’t get the overheatwarning. Your engine could catch fire and you orothers could be burned. Use a 50/50 mix of cleanwater and DEX-COOL TM (orange-colored,silicate-free) antifreeze.If you have to add coolant more than four times a year,have your dealer check your cooling system.NOTICE:If you use the proper coolant, you don’t have toadd extra inhibitors or additives which claim toimprove the system. These can be harmful.6-23