1997 Buick Riviera Owner's Manual - Page 251

RECOMMENDED SAE VlSCOSlTT GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VlSCOSllV GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER + l o o - - +38 +80- - + 2 7 +60--+16 +40- - + 4 As shown in the chart,SAE 1OW--3 is best for your SAE vehicle. However, you can use 5W-30 if it's going 60" to be colder than F (16"C) before your next oil SA change. When it's very cold, you should use E 5W-30. These numbers on an container show its oil viscosity, or thickness.Do not use other viscosity oils, such asSAE 2OW-50. NOTICE: Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines "Starburst" symbol. Failure use the to recommended oil can result in engine damage not covered by your warranty. GM Goodwrench@ oil meets the requirements for all your vehicle. COLD WEATHER DO NOTUSESAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED +20---7 0 - --18 If you are in an area where the temperature falls below -20°F (-29"C), consider using eitheran S A E 5W-30 SAE OW-30 oil. Both will provide synthetic oil or an easier cold starting and better protection for your engine at extremely low temperatures. 6-14