1998 Oldsmobile Bravada Owner's Manual - Page 266

NOTICE: If you use an impropercoolant mixture, your engine could overheat and be badly damaged. The repaircost wouldn't becovered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heatercore and other parts. If you have to add coolant more than four times a year, have your retailer check your cooling system. Checking Coolant I NOTICE: If you use the proper coolant, you don't have to add extra inhibitorsor additives which claim to improve the system. These can be harmful. I When your engine is cold, the coolant level should be at ADD, or a little higher. When your engine is warm, the level should be up to FULL HOT, or a little higher.