1997 Pontiac Bonneville Owner's Manual - Page 269

RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STIIRTING, SELECT THE LOWEST SAf YSCDSJTY OIL FOR THE EXPECTED TEMPERATURE RANGE. = D E HOT WEATHER I 7 LOOK FOR THIS SYMBOL As shown in the chart, S A E 1OW-30 is best for your vehicle. However, you can use S A E 5W-30 if it's going to be colder than 60 O F ( 16 C) before your next oil change. When it's very cold, you should use SAE 5W-30. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 2OW-50. O "F k 100 "C - . +30 NOTICE: + 80 - - +27 +60. - + 16 +40- - +4 --7 + 20. 0. - -18 I -SAE 5W-M DQ NOT USE SAE ZOW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED Use only 'engine with thle American Petroleum oil Institute Certified For Gasoline Engines "Starburst" symbol. Failureto use the recommended oil can result engine damage in not covered by your warranty. GM Goodwrench@ail meets all the requirements for your vehicle. WEATHER If you are in an area where the temperature falls below -20°F (-29"C), consider using either an SAE 5W-30 synthetic oil or an S A E OW-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. 6-16