1997 Buick Century Owner's Manual - Page 287

What to Use Use a mixtureof one-half dean water (preferably distilled) and one-half DEX-COOL@ coolant which won't damage aluminum parts. If you use this mixture, you don't need to add anything else. NOTICE: If you use an improper coolant mix, your engine could overheat andbe badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. Adding only plain water to your cooling system can be dangerous. Plain water, some other or If you have to add coolant more than four times ayear, liquid like alcohol, can before the proper boil have your dealer check your cooling system. coolant mixwill. Your vehicle's coolant warning system is set for the proper coolant With mix. plain water or the wrong mix, your engine could NOTICE: get too hot but you wouldn't get the overheat If you use the proper coolant,you don't have to warning. Your engine could catch fire and or you add extra inhibitors or additives which claim to others could be burned. a 50150 mix of clean Use improve the system. These can be harmful. water and DEX-COOL@coolant. 6-21