1998 Oldsmobile Achieva Owner's Manual - Page 209

A CAUTION: Adding onlyplain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol,can boil beforethe proper coolant mixture will. Your vehicle'scoolant warning system isset for the proper coolant mixture. Withplain water or the wrong mixture, your engine could get hot but you wouldn't too get the overheat warning. Your engine could catch fire andyou or others could be burned. Use a 50/50 mixture of clean water and DEX-COOL@coolant. I NOTICE: In cold weather,water can freeze and crack the engine, radiator, heater core and other parts. So use the recommended coolant. A CAUTION: ~ You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and itwill burn if the engine parts are hot enough. Don't spill coolant on a hot engine. 5-21