1996 Pontiac Bonneville Owner's Manual - Page 268

NOTICE: When adding coolant it is important thatyou use DEX-COOL TM (orange-colored, silicate-free) coolant meeting GM Specification 6277M. I silicated coolant is added to thesystem, f premature engine, heater core or radiator corrosion may result. In addition, the engine -coolantwill require changesooner at 308,000 miles (50 000 km) or 24 months whichever occurs first. GM Engine Coolant Supplement (sealer) Part (GM No. 3634621) with any complete coolant change. you If use this mixture, you don't need to anything else. add -- ' ' . What toUse Use a mixture of one-half clean water (preferably distilled) and one-half DEX-COOL (orange-colored, silicate-free) antifreeze that meets Specification GM 6277M, which won't damage aluminum parts. Use Adding only plain 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'scoolant warning system isset for the proper coolant mix. With plain wateror the wrongmix, your engine could get too hot but you wouldn't get the overheat warning. Your enginecould catch fire and or you others could be burned. Use a 5060 mix of clean water andDEX-COOL TM (orange-colored, silicate-free) antifreeze. L