1997 Chevrolet Lumina Owner's Manual - Page 247

RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THEEXPECTEDTEMPERATURERANGE. I As shown in the chart, if you have the 3.4L DOHC engine, SAE 1OW-30 is best for your vehicle. However, you can use SAE 5W-30 if it's going to colder than be 60O F (16 O C) before your next change. When it's oil very cold, you should use S A E 5W-30. These numbers on an oil container showits viscosity, or thickness. Do not use other viscosityoils, such as SAE 2OW-50. HOT WEATHER NOTICE: Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines "Starburst" symbol. Failure to use the recommended oil can result in engine damage not covered by your warranty. PREFERRED .bow WF SAE sw-30 (-18%) GM Goodwrench@oil meets all the requirements for your vehicle. If you are in an area where the temperature falls below -20°F (-29"C), consider using either an SAE 5W-30 synthetic oilor an SAE OW-30 oil. Both will provide easier cold starting better protectionfor your engine and at extremely low temperatures. COLD WEATHER DO NOT USE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED I 6-15