Not to be a jerk or anything but I was re-reading my service manual and the wrench shows up prior to your next suggested service and it will display the number of day or miles left before your service is due. I just want to clear this up so people don't see the wrench and think that they have to get the service/oil change done right away. I know my wrench with the clock has been on since I bought the car and that was when the car had 30 miles on.