1996 Oldsmobile Achieva Owner's Manual - Page 245

NOTICE: When adding coolant is important thatyou use it DEX-COOL (orange-colored, silicate-free) coolant meeting GM Specification 6277M. If silicafedcoolant is added to the system, premature engine, heater core or radiator corrosion may result. addition, the In engine coolant will require change sooner at 30,000 miles (50 000 km) or24 months whichever occurs first. I CAUTION: - -- What toUse Use a mixtureof one-half clean water (preferably distilled) and one-half DEX-COOL TM (orange-colored, silicate-free) antifreeze that meets GM Specification 6277M, which won't damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 3634621) with any complete coolantchange. If you use this mixture,you don't need to add anything else. Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can before the proper boil coolant mix will. Your vehicle's coolant warning system'is set for the proper coolant With mix. plain water or the wrong your enginecould mix, get too hot butyou wouldn't get the overheat warning. Your engine could catch fire and or you others couldbe burned. Use a 50/50 mix of clean water and DEX-COOL TM (orange-colored, silicate-free) antifreeze. 6-23 .