1997 Buick Riviera Owner's Manual - Page 259

NOTICE: When addingcoolant, it is important thatyou use only DEX-COOL@(silicate-free) coolant. If coolant otherthan DEX-COOL@ added to is the system, premature engine, heater coreor radiator corrosion may result. In addition, the engine coolantwill require change sooner at 30,000 miles (50 000 km) or 24 months, whichever occursfirst. Damage causedby the use of coolant otherthan DEX-COOL@ not is covered by your new vehicle warranty. What to Use Use a mixture one-half clean water(preferably of DEX-COOL@coolmt which distilled) and one-half If won't damage aluminum parts. you use this mixture, you don't np-4 to add anything else. -- ~~~~~~~~ ~~~~ ~~~ Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid likealcohol, can boil before the proper coolant mix will. Your vehicle'scoolant warning system is set for the proper coolant With mix. plain water or thewrong mix, your engine could get too hot but you wouldn't get the overheat warning. Your engine could catch fire and you or others couldbe burned. Use a 50/50 mix of clean water and DEX-COOL@ coolant. 6-22