1995 Buick Regal Owner's Manual - Page 218

What Kind of Oil to Use Oils of the proper quality for your vehicle can be identified by looking for the "Starburst" symbol. The "Starburst" symbol indicates that the oil has been certified by the American Petroleum Institute (API), and is preferred for use in your gasoline engine. 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 oil put into your engine is American Petroleum Institute certified for gasoline engines. You should also use the proper viscosity oil for your vehicle, as shown in the following chart: As shown in the chart, SAE 5W-30 is best for your vehicle. However, you can use SAE 1OW-30 if it's going These numbers on an oil to be0°F (- 18°C) or above. container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50. ~~~~~ ~ ~ RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS ~~ ~~~ FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADEOIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER LOOK FOR THIS SYMBOL @ & SAE 1OW-30 r RED COLD WEATHER DO NOT USE SAE 2OW-50 OR ANYOTHER GRADE OIL NOT RECOMMENDED 3.1L L82 (Code M) Engine 6-10