This is all in your Owners Manual. You know that book in the glove box no one ever reads. It's on pg. 34 I think. To reset the oil monitoring system to 100% after each oil change (approximately 7,500 miles [12,000 km] or six months) perform the following: 1. Press and hold the SELECT/RESET stem for more than two seconds. Oil life is set to 100% and OIL LIFE SET TO 100% is displayed. Note: To change oil life 100% miles value from 7,500 miles (12,000 km) or six months to another value, proceed to Step 3. 2. Once OIL LIFE SET TO 100% is displayed, release, press and hold the SELECT/RESET stem for more than two seconds to change the oil life start value. Each release, press and hold will reduce the value by 10%. 3. After setting the oil life start value, press the SELECT/RESET stem for the next setup menu item or wait for more than four seconds to return to the info menu. Note: Oil Life Start Value of 100% equals 7,500 miles (12,000 km) or six months. For example, setting oil life start value to 60% sets the oil life start value to 3,000 miles (4,800 km) and 120 days.