My Audi A6 has done 62k miles. Registered April 2007. I'm just about to have it serviced and the Audi specialist garage says at 5 years or 75k I should have my timing belt changed. Should I? In the service book it says that the 'toothed belt' which I assume is the same thing, is 80k miles. If I do get the belt changed it's costing around £475 in addition to the service. I've got another 18k to do if it's 80k.