You are correct. If you let it go past the day/milage you get a negative (-) number. When I bout my first Limited it kept coming up with -265, -266, -267 and so on each day that I drove it. Then I read the book and found out that I was that many days past the recommended time to change the oil. I bout the car with 2900 miles on it and it was two years old! I had the oil changed and reset the counter myself.

MikeR