1994 Buick Roadmaster Owner's Manual - Page 235

What Kind of Oil to Use Beginning midyear 1993, oils of the proper quality for your vehicle willbe identified with thisnew "starburst" symbol. The "starburst" symbol indicates that the oil has been certified by the American Petroleum Institute (API), and is preferred use in your gasoline engine. for You should look for 'thison the front of the oil container,and use only oils that display this new symbol. RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER "F ~ LOOK FOR ONE OF THESE LABELS. 100 + 80 + 60 + 40 " I + 20 0 \E 1OW-30 You should also use the proper viscosity oil for your vehicle, as shown in the following chart: ~ SAE 5W-30 PREFERRED COLD WEATHER IF NEITHER SAE 5W-30 NORSAE 1OW-30 GRADE OILS AREAVAILABLE,SAE 30 GRADE MAY BE USED AT TEMFERATURES ABOVE 40 DEGREES F (4 DEGREES C). DO NOT USE SAE 1OW-40, SAE 2OW-50 OR ANYOTHERGRADE OIL NOT RECOMMENDED 233