My A4 2.0T quattro has just become 5 years old, with 34,000 miles on the clock. I've just had a reminder from Audi that the cam belt is due and their cost is £349. They recommend changing it at 75,000 miles or 5 years old, which ever comes first. Do I need to get this done now - or will I be OK postponing? Also is it worthwhile having it done at an independant rather than the stealer? Thanks, Tim.