1997 Buick Century Owner's Manual - Page 286

Engine Coolant The cooling s stem in your vehicle is filled with DEX-COOL J engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 k )whichever occurs first, if you add only m DEX-COOL' extended life coolant. 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. NOTICE: When adding coolant, is important thatyou use it only DEX-COOL@silicate-free) coolant. If coolant other than DEX-COOL is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolantwill require change sooner at 30,000 miles (50 000 km) or24 months, whichever occurs first. Damage caused the use by of coolant other than DEX-COOL@is not covered by your new vehicle warranty. -- A 50/50 mixture of water and DEX-COOL@ coolant will: 0 0 0 Give freezing protection down to -34°F (-37°C). Give boiling protection up to 265 O F ( 129O C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. 0 6-20