1997 Buick Regal Owner's Manual - Page 289

NOTICE: Don't add too much If your engine has oil. so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, your engine could damaged. be Be sure to fill it enough to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you're through. What Kind of Oil to Use Oils recommended foryour vehicle can be identified by looking for the "Starburst" symbol. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this Starburst symbol. If you change your own oil, be sure you use oil that has the Starburst symbol on the front of the oil container. If you have your oil changed for you, be sure the oil put into your engine is American Petroleum Tnstitute certified for gasoline engines. You should also use the proper viscosity oil for your vehicle, as shown in the following chart: The engine oil fill cap is located toward the front of the engine near the yellow-loopedengine oil dipstick handle.