1995 Buick Roadmaster Owner's Manual - Page 226

What Kind of Oil to Use Oils of the proper quality your vehicle can be for identified by looking the "Starburst" symbol.The for "Starburst" symbol indicates that oil has been the ceqified by the American Petroleum Institute (API), and is preferred for use in your gasoline engine. RECOMMENDEO SAL VISCOSITY GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST THE SAE UlSCOSlTY GRADE OIL 'MR EXPECm TEMPERATURE RANGE. I I FOR ' If you change your own oil, be sure you use oil that has the "Starburst" symbol on the front of the oil container. HOT WEATHER LOOK FOR THIS SYMBOL /QF+80- .c' +loo- - t38 - +27 +60- - + 1 6 +40- -+b 1 +20---7 0 - --18 I - S 1W-30 M If you have your oil changed you, be sure the oil put for into your engine American Petroleum Institute is certified for gasoline engines. You should also use the proper viscosity oil your for vehicle, as shown in the following chart: ,w/J COLD WEATHER IF NEITHER S M JW-30 NOR SAE low-30 GRADE OILS ARE AVAILABLE, SAE 30 GRADE MAY BE USED AT TEMPERATURES ABOVE 40 DEGREES F (4 DEGREES C). DO NOT USE SAE 1OW-40, SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECQMMENDED