1998 Oldsmobile Achieva Owner's Manual - Page 251

NOTICE: If you usean improper coolant mixture, your engine couldoverheat and be badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times ayear, have your retailer check your cooling system. Checking Coolant I NOTICE: If you usethe proper coolant, you don't have to add extra inhibitors or additives which claim to improve the system. Thesecan be harmful. I The surge tank is located on the passenger's side of the engine compartment. 6-23