1997 Cadillac DeVille Owner's Manual - Page 295

What Kind of Oil to Use Oils recommendedfor your vehiclecan be identified by looking for the "Starburst"symbol. This symbol indicates that the has been certified by the American oil Petroleum Institute (API). not use any oil which Do does notcarry this Starburst symbol. If you change your own oil, be sure use oil you that has the Starburst symbol on the front of the oil container.If you have your oil changed for you, be surethe oil put into your engine is American Petroleum InstitGte certified for gasoline engines. RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR B€ST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER LoOK FOR THIS SYMBOL You should alsouse the proper viscosity oil for your vehicle, as shown in the following chart: COLD WEATHER DO NOT USE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED 6-12