1998 Oldsmobile 88 Owner's Manual - Page 251

6 NOTICE: ~f usean improper coolant mixture, your you 1 Checking Coolanl engine could overheat be badly damaged. and The repair cost wouldn't be covered by your . , warranty. Too much water the mixturecan in freeze and crack the engine, radiator,heater core and other parts. If you haveto add coolantmore'than four times a year, have your retailer check your cooling system. I NOTICE: I you use the proper coolant, you don't have f to add extra inhibitors or additives which claim to improve the system. These can be harmful. I When your engine is cold, the coolant level should be at FULL COLD or a little higher. When your engine is warm, the level should be up FULL HOT or a to little higher. 6-22