2004-2005
Turn the ignition to run (one position before starting engine).
Immediately after Step 1 press and release the gas pedal 3 times within 5 seconds.
Turn the ignition off and then start the engine to verify the indicator has been reset.
2006-2010
Turn the ignition to run (one position before starting engine).
With the CHANGE OIL SOON message displayed, press any of the 3 DIC buttons to clear the CHANGE OIL SOON message.
Display OIL LIFE RESET on the DIC.
Press and hold the ENTER button for at least 1 second. An ACKNOWLEDGED display message will appear for 3 seconds or until the next button is pressed. This will tell you the system has been reset.
Turn the ignition off and then start the engine to verify the indicator has been reset.
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This worked for our 2009 G6 and might work for later models with Driver Information Centre (DIC) buttons. Turn key on but not engine. Press INFO button until you see Oil Life % (in our case 25%). Press gas pedal 3 times quickly.