1998 Buick Park Avenue Owner's Manual - Page 288

Oils recommended for your vehicle can be identified by looking for the '"Starburst" symbol. Vas symbol indicates that the 0iI has been certified by the American Petroleum Institute (AH). Do not use any oil whch does not c m y this Starburst symbd. 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 02 put into your engine is American Petroleum Institute certified f ~ r P oil dipstick. gasoline engines. Be sure to fill it enough tc put the Bevel somewhere in the proper operating range. Push the dipstick all the way back in when you're through. You should also use the prcper viscosity oil for your vehicle, as shown in the following chart: