GM Service Manual Online
For 1990-2009 cars only

After changing the engine oil, the system must be reset. Here's how to reset the system:

  1. Remove the cover of the underhood fuse block under the hood.
  2. With the ignition key in "RUN" and the engine off, press the red "Oil-Reset" reset button and hold for 5 seconds.
  3. If the CHANGE OIL SOON light is flashing, the system is reset.

The light will flash up to 30 seconds or until the ignition is turn off. However, if the light comes on again and stays on for 30 seconds at the next ignition cycle, it did not reset. You'll need to reset the system again.