One thing I am confused about is do you go buy mileage or age of the belt? I have a 2002, and it was manufactured in January of 2002,even though I bought in August of 2002. I have 57,000 miles on it. According to the severe maintenance schedule, it says to change it every 60k or 7 years, normal maintenace is 90k. However, I have read conflicting recommendations. Some say to go strictly by mileage,others by age. Any thoughts?