When should you change the timing belt on my Audi A4 petrol 2002 model?

either 6 years or 80,000 miles. I bought my 02 a4 3.0 with 80,000 miles on it and got the timing belt and water pump service before i really drove the car a lot. the belt is rubber and can easily wear in 6 years. better safe than sorry.

The recommended service is to change it every 90,000 ,mlles. This is an interference engine so if the belt breaks you will have engine damage. Do not neglect this service.