1997 Cadillac DeVille Owner's Manual - Page 296

As shown inthe chart, SAE 1OW-30 is best for your vehicle. However, you use SAE 5W-30 if it's can going to be colder than 60OF (16O C) before your next oil change. When it's very cold, you should use SAE 5W-30. These numbers on anoil container showits viscosity, or thickness. Do not use other viscosity oils, such as S A E 20W-50. Engine Oil Additives Don't addanything to your oil.Your Cadillac dealeris ready to advise if think something should be added. you When to Change EngineOil Your Cadillac has an Oil Life Indicator. This feature will let you know when tochange your oil and filter -- usually between 3,000 miles 000 km) and (5 7,500 miles (12 500 km) since your last oil change. Under severe conditions, the indicator may come on before 3,000 miles (5 000 km). Never drive your vehicle more than 7,500 miles (12 500 km) or 12 months (whichever occurs first) without an oil change. The system won't detectdust in the oil. So, if you drive in a dusty area, be sure to change your oil every 3,000 miles (5 000 km) or sooner if the CHANGE ENGINE OIL message comes on. Remember to reset Oil Life Indicator when the the oil has been changed. more information, see For "Oil Life Indicator" in the Index. 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. I 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 oil or an SAE OW-30 oil. Both will provide easier cold starting and better protection your engine for at extremely low temperatures. I 6-13