1997 Oldsmobile Silhouette Owner's Manual - Page 310

The engine oil fill cap is located just behind the engine oil dipstick. What Kind of Oil to Use Oils recommended for your 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 Institute certified for gasoline engines. You should also use the proper viscosity oil for your vehicle, as shown in the following chart: Just 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. 6-12