This should be in your owner's manual.
Follow this procedure to reset the GM oil life system:
1.. Turn the ignition to ON without starting the engine.
2.. Fully press and release the accelerator pedal three times within five
a.. If the CHANGE OIL SOON indicator flashes two times, the system is
b.. If the CHANGE OIL SOON indicator comes on and stays on for five
seconds, try to reset the system again.
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