1996 Buick Regal Owner's Manual - Page 244

NOTICE: If you use an improper coolant mix, your engine could overheat and be badly damaged. The repair cost wouldn't covered by your be warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. :king Coolant If you have to add coolant more than four times a year, have your dealer check your cooling system. I NOTICE: If you use the proper coolant, you don't have to add extra inhibitors or additives which claim to improve the system. These can harmful. be -1 When your engine is cold, the coolant level should be at the COLD mark or a little higher. When your engine is warm, the level should be up to the HOT mark or a little higher.