1996 Buick Riviera Owner's Manual - Page 251

r I _ .. . 'Whenadding coolant it is important thatyou use DEX-COOL (orange-colored, silicate-free) coolant meeting GM Specification 6277M. If silicated coolant is added to the system, premature engine, heater core or radiator corrosioq way result. In addition, theengine coolant will require change sooner at 30,800 miles (50 000 km) or 24 months whichever occurs first. TM -- What toUse Use a mixture.of one-half clean water (preferably ' distilled) and one-half DEX-COOL TM (orange-colored, GM silicate-free) antifreeze that meets Specification 6277M, whichwon't damagealuminum parts. Use GM Engine Coolant Supplement (sealer) (GM P r at No. 3634621) with any complete coolant change. you If we this mixture, you don't needto add anything else. Adding only plain water toyour coolin#pystem can be dangerous. Plain water, 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 mix. With plain water or the wrong mix, your engine could get too hot but you wouldn't get the overheat warning. Your engine could catch fire and or you others could be burned. Use a 50/50 mix of clean waterand DEX-COOL (orange-colored, silicate-free) antifreeze. 6-22