My 2,8 V6 has only done 40,000 miles since it had it belt and tensioner changed. I know you only have to change them every 75,000 miles. But it has been over five years since that new belt was fitted. My local VW/AUDI specialist tells me i should get it changed as its over five years old and it is now time. Is this correct? If so any idea how much am I going to pay for this? Thanks