1997 Oldsmobile Achieva Owner's Manual - Page 256

NOTICE: If you use an improper coolant your engine mix, could overheat and be badly damaged. The repair cost wouldn't be covered your by warranty. Too much water in the can freeze mix and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a yea, have your retailer check your cooling system. Checking Coolant I NOTICE: If you use the proper coolant, don't have to you add extra inhibitors or additives which claim to improve the system. These can be harmful. The surge tank is located on the passenger's side of the engine compartment. 6-26