You can reset it anytime you wish by HOLDING down the reset till its RESET as the last post stated. The Oil Monitoring system uses OIL TEMP, RPM (TORQUE), TOTAL RUN TIME, WATER TEMP, IDLE TIME, AIR TEMP, AND 4X4 use. Make sure you have your on board system set at NORMAL driving and not TRAILERING, TRIALERING WITH SIGNIFICANTLY SHORTEN THE CHANGE INTERVAL. The maunal says for NORMAL driving you can expect up to 10,000 miles or one year between oil changes. MY DEALER WANTS ME TO COME BACK EVER 3.000 MILES, ????? .........I am gonna come back when the OLMS says its time to change.