1997 Pontiac Grand Prix Owner's Manual - Page 296

I The cooling system in your vehicle is filled with new DEX-COOL engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000miles '(240000 h whichever occurs first. ) , TM NOTICE: When adding coolant, it is important you that use only IBEX-COOL silicate-free coolant. If silicated coolant is added the system, to premature engine, heater core radiator or corrosion may result. In addition, the engine coolant will requipe change sooner at 30,000 miles (50 000 km) or 24 months, whichever occurs first. TM The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating or if you need to add coolant to your radiator, see "Engine Overheating" in the Index. A $OB0 mixture of water and the proper coolant for your Pontiac will: -- Give freezing protection down to -34°F (-37°C). Give boiling protection up to 265 "F (129' C). 0 0 0 Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. 6-26