1997 Oldsmobile Bravada Owner's Manual - Page 240

Whatto Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See "Recommended Fluids and Lubricants" in the Index. NOTICE: When adding coolant, it is important that you use only DEX-COOL (silicate-free) coolant. If silicated coolant is addedto 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. TM Engine Coolant 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 (240 000 km), whichever occurs first, if you add only DEX-COOL" extended lifecoolant. The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating, see "EngineOverheating" in the Index. -- What to Use Use a mixture of one-half clean water (preferably distilled) and one-half DEX-COOL TM coolant which won't damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 3634621) with any complete coolant change. If you use this mixture, you don't need to add anything else. A 50/50 mixture of water and the proper coolant for your Oldsmobile will: 0 0 Give freezing protection down to -34°F (-37°C). Give boiling protection up to 265 "F (129°C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. 0 0 0