To reset the 2004 Mercury Monterey oil life, please follow these instructions:
1. Turn the ignition to run (one position before starting engine). 2. Press the STATUS control to access the System Check function. 3. Press RESET to reset oil %. 4. Press and hold the RESET control to set to 100%. After a successful reset, the message centre will display OIL LIFE SET TO 100%. 5. Turn the ignition off and then start the engine to verify the indicator has been reset.