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
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.