Hi, if it helps, I have a 2004 Audi A4 1.8T and Audi Bath have told me that the Cambelt should be changed every 5 years or 112500 Miles (I assume the mileage has been converted from Km!) - whichever comes soonest. The general concensus also seems to be that you should get tensioners, pulleys and water pump changed at the same time. I was quoted £520, but I think that was only for the cambelt change
