1997 Buick LeSabre Owner's Manual - Page 268

~ NOTICE: When adding coolant, it is important thatyou use only DEX-COOL' (silicate-free) coolant. If coolant other thanDEX-COOL' is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner at 30,000 miles (50 000 km) or 24 months, whichever occurs first. Damage causedby the use of coolant other thanDEX-COOL@is not covered by your new vehiclewarranty. fi CAUTION: Adding onlyplain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mix will. Your vehicle's coolant warning system is set for the proper coolant mix. With plain water or the wrong mix,your engine could get toohot but you wouldn't getthe overheat warning. Your engine couldcatch fire and or you others could beburned. Use a 50/50 mix of clean water andDEX-COOL@ coolant. -- L What to Use Use a mixture of one-half clean water (preferably distilled) andone-half DEX-COOL@coolant which If won't damage aluminum parts. you use this mixture, you don't need to add anything else.