So I had a chat with a relative who owns a 2.0Tdi 150 A4 B9 saloon 65 reg, his car is coming to 55k mileage soon and will be 5 years old around September, my own A4 is on 85k and I plan to keep it for 2-3 years so was thinking about having both cars done at a discount. I know the timing belt on these things should be changed around 5 years or 135k miles or so, however I’ve never actually owned a car when the timing belt was due, I’ve always had chains or cars before timing belts were due or after they had been done. From what I know, belts were usually changed around 80k so it’s surprising this one is recommended at 135k, so that’s the reason for me to consider getting it done. Anyhow, relative insists that age doesn’t really have an effect. He claims Audi don’t have a set time only mileage in certain countries, he has also owned many more cars as he’s twice my age. Have I missed something? The belt is made of rubber which I know from tyres can dry rot.