1995 Oldsmobile 88 Owner's Manual - Page 239

To Check Engine Oil Pull out the dipstick clean it with apaper towel or and cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level. What Kind of Oil to Use Oils of the proper qualityfor your vehiclecan be identified bylooking for the "Starburst" symbol. The "Starburst" symbol indicates thatthe oil has been certified by the American Petroleum Institute (API), and is preferredfor use in your gasoline engine. If you change your own oil, be sure you useoil that has the "Starburst" symbol on the front of the oil container. When to Add Oil If the oil is at or belowthe ADD mark, then you'll need to add some oil. But you must usethe right kind.This part explains what kind oil to use.For crankcase of capacity, see "Capacities and Specifications"in the Index. NOTICE: Don't add too much oil. your engine has If so much oil that the level gets above the oil cross-hatched area that shows the proper operating range, your engine could be damaged. Just fill it enough to putthe level somewhere in the proper operating range.Push the dipstick allthe way back in when you're through. I I If you have your oil changed for you, be sure the oil put into yourengine is AmericanPetroleum Institute certified for gasoline engines. You should also use proper viscosity oil for your the vehicle, as shownin the following chart: