1997 Buick LeSabre Owner's Manual - Page 259

I I The engine oil fill cap is behind the engine oil dipstick and engine fans. 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 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 (APT). 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 symbolon 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. When to Add Oil If the oil is ator below the ADD mark, then you'll need to add at least one quartof oil. But you mustuse the right kind. This part explains what kind of oil to use. For crankcase capacity, see "Capacities and Specifications" in the Index. I NOTICE: Don't add too much oil. If your engine has so much oil that the oil levelgets above the cross-hatched area that shows the proper operating range, your engine could be damaged. I A You should also use the proper viscosity oil for your vehicle, as shown in the following chart: 6-11