GM Service Manual Online
For 1990-2009 cars only

When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE OIL SOON message will come on. Change the engine oil as soon as possible within the next 600 miles (1 000 km). It is possible that, if driving under the best conditions, the oil life system may not indicate that an oil change is necessary for over a year. However, the engine oil and filter must be changed at least once a year and at this time the system must be reset.

If the system is ever reset accidentally, change the engine oil at 3,000 miles (5 000 km) since last oil change.

How to Reset the Engine Oil Life System

  1. Turn the ignition key to the ON position without starting the engine.
  2. Press the INFO button on the Driver Information Center (DIC) until OIL LIFE REMAINING is displayed.
  3. Press and hold the INFO RESET button until 100 percent is displayed. This resets the oil life indicator.
  4. Turn the key to OFF.

If the CHANGE ENGINE OIL SOON message comes back on when you start the vehicle, the ENGINE OIL LIFE SYSTEM has not reset. Repeat the procedure.