1993 Cadillac DeVille Owner's Manual - Page 286

How To Reset the Oil Life Indicator: After the oil has been changed, press and hold the "RANGE" and "RESET" buttons between 5 and 60 seconds. Once the buttons are released the "CHANGE OIL SOON" light will flash 4 times to indicate it has reset to 100. If the "CHANGE OIL SOON" light comes on for5 seconds it did not reset. You will need to reset the system again. The percentage of oil life remaining may be checked at any time by pressing the "RANGE" and "FUEL USED" on the Fuel Data center. Engine Block Heater: engine block heater can be a big help if you An have to park outside in very cold weather, O°F (-18OC) or colder. If your vehicle has this option, see "Engine Block Heater" in the Index. What to Do with Used Oil: ' A CAUTION: Used engine oilcontains things that have caused skin cancer in on laboratory animals. Don't let used oil stay your skinfor very long. Clean your skin and nails with soap and water, or a good hand cleaner.Wash or properly throw away clothing or rags containing used engine oil. Used oil can be a real threat to the environment. If you change your own oil, be sure to drain all free-flowing oil from the filter before disposal. Don't ever dispose of oil by pouring it on the ground, into sewers, or into streams or bodies of water. Instead,recycle it by taking it to a place that collects used oil. If you have a problem properly disposing of your used oil, ask your dealer, a service station or a local recycling center forhelp.