I have a 2001 Volkswagon Beetle with 55,000 miles on it. I made an appt. with the car dealership in a week . THey mentioned that the timing belt may need replacement even though it has low mileage. Can I trust them that my timing belt may need replacing or is this just a way for them to get me to spend a lot of money? Do timing belts really wear out from years and not mileage?