1997 Oldsmobile Cutlass Owner's Manual - Page 235
1997 Oldsmobile Cutlass Manual
Page 235 highlights
What Kind of Oil to Use Oils recommendedfor your vehicle can be identified by looking for the "Starburst" symbol.This symbol indicates that the oil has been certified the American by Petroleum Institute (API).Do not use any oil which does not carry this Starburst symbol. The oil fill cap for the 3 100 engine is located on the front of the engine. Be sure tofill it enough to put the level somewhere in the proper operating range. Push dipstick all the the way back in when you're through. If you change your own oil, be sure you use that has oil the Starburst symbol on the front of the oil container. If you have your changed oil for you, be sure the oil put into your engine is American Petroleum Institute certifiedfor gasoline engines. You should also use the proper viscosity for your oil vehicle, as shown in the following chart: 6-12