2007 GMC Acadia Owner's Manual - Page 401

How to Reset the Engine Oil Life System The Engine Oil Life System calculates when to change the engine oil and filter based on vehicle use. Whenever the oil is changed, reset the system so it can calculate when the next oil change is required. If a situation occurs where you change the oil prior to a CHANGE ENGINE OIL SOON message being turned on, reset the system. If your vehicle does not have a Driver Information Center (DIC): 1. Turn the ignition to ON, with the engine off. 2. Fully press and release the accelerator pedal slowly three times within five seconds. 3. Turn the key to OFF. If the CHANGE ENGINE OIL SOON message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure. If your vehicle has a DIC: 1. Turn the ignition to ON, with the engine off. 2. Press the MODE button until the DIC reads OIL LIFE LEFT/HOLD SET TO RESET. 3. Press and hold the SET button until 100% is displayed. You will hear three chimes and the CHANGE ENGINE OIL SOON message will go off. 4. Turn the key to OFF. If the CHANGE ENGINE OIL SOON message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure. 401