1997 Buick Skylark Owner's Manual - Page 258

What to Use Use amixture of one-half clean water (preferably distilled) and one-halfDEX-COOL@coolant which won't damage aluminum parts. you use this mixture, If to you don't need add anythingelse. NOTICE: If you use an improper coolant mix, your engine could overheat and be badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in mix can freeze the and crack the engine, radiator,heater core and other parts. If you have to add coolant more than times a year, four have your dealer check your cooling system. Adding only plain water to your cooling system can be dangerous. Plain water,some other or liquid like alcohol, boil beforethe proper can coolant mix will. Your vehicle's coolant warning system is set the proper coolant mix. With for plain water or the wrong mix, your engine could get toohot but you wouldn't getthe overheat catch fire and you or warning. Your engine could others could beburned. Use a 50/50 mix ofclean water and DEX-COOL@ coolant. NOTICE: If you use the proper coolant, you don't haveto add extra inhibitors or additives which claim to improve the system. These can harmful. be 6-23