1998 Oldsmobile Cutlass Owner's Manual - Page 234

What Kind of Engine 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 frontof the oil container. RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BESTFUELECONOMYANDCOLDSTARTING,SELECTTHELOWEST SAL VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER 7 LOOK FOR THIS SYMBOL "C +loo- + 3a + 21 + 16 +4 + 80 + 60 +40- + 20 0- -7 - 18 SAE 1OW-30 If you have youroil changed for you, be sure the oil put into your engineis American Petroleum Institute certified for gasoline engines. You should also use proper viscosity oil your the for vehicle, as shown the following chart: in SAE SW-30 PREFERRED COLD WEATHER DONOT USE SAE 2OW-50 OR ANYOTHER GRADE OIL NOT RECOMMENDED 6-14