F 550 4WD Super Duty V10-6.8L (2009)
4. NOTE: The oil life start value reduces by 10% for each second that the SELECT/RESET button is held once the oil life start value begins
decreasing.
Continue to hold the SELECT/RESET button until the oil life begins to decrease in value (from 100% down to 10%), continuing to hold until the
desired start value is displayed.
5. Release the SELECT/RESET button and allow the setup timer to expire to exit the procedure.