I know that the break-in period is 100 miles or 20 hours which ever comes first. I bought my last friday and it was in the showroom with 1 mile on it. However when I got home with it I noticed that the engine time was already at 15 hours. How does Honda record engine time? When its running? Or just when you turn the key and light up the dash. I could see maybe if it was just turning the key to get 15 hours but I'm puzzled that either Honda or the Honda Dealer would let it idle for so long. Now I have 35 miles and 20.5 hours. So in theory its time to change the oil/oil filter. What are your guys opinions? Another question when changing the oil and checking things over. Did you just check the front/back diffs or did you change them. Also if you changed them did you replace the seals/o-rings or just the fluid. THanks