1995 Buick Century Owner's Manual - Page 222

~ I -.-- Engine Coolant The following explains your cooling system and how to add coolant when it islow. If youhave a problem with engine overheating or if you need to add coolant to your radiator, see "Engine Overheating" inthe Index. The proper coolant foryour Buick will: Give freezing protection down to -34°F (-37°C) . Give boiling protection up to 262°F (128 " C ) . Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights work as they should. ' What to Use Use a mixture of one-half clean water (preferably distilled) and one-half antifreeze that meets "GM Specification 1825-M," which won't damage aluminum parts. You can also use a recycled coolant conforming to GM Specification 1825-M with a complete coolant flush and refill. If you use thismixture, you don't need to add anything else. NOTICE: If you use an improper coolant mix, your engme could overheat and be badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. 6-18