1996 Oldsmobile Silhouette Owner's Manual - Page 265

NOTICE: when adding coolantit is important thatyou use DEX-COOL (orange-colored, silicate-free) coolant meeting GM Specification 6277M. If'silicatedcoolant is added to the system, premature engine, heater coreor 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. Adding only plain water to yourcooling system can be dangerous. Plainwater, 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 With mix. plain wateror the wrong mix, your engine could get too hot but you wouldn't getthe overheat warning. Your engine could catch fireand you or others could be burned.Use a 50/50 mix of clean water and DEX-COOL (orange-colored, silicate-free) antifreeze. -- What to Use Use a mixture one-half clean water (preferably of distilled) and one-half DEX-COOL (orange-colored, silicate-free) antifreeze that meets Specification GM 6277M, which won't damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 3634621) with any complete coolant change. you If use this mixture, don't need to add anything else. you 6-19