Having just exchange my TT for an a4 avant 130Bhp can someone confirm when you should change the oil. It's done 33k and the next service is due (screen display) at 42K. it's only had 1 service at 22k and the oil wasn't changed. I thought you should change the oil for a diesel every 10k . Can someone confirm that i should simply follow the on screen disply as i think changing the oil every 30-40k seems a bit high. rgds Mike Also What's the best method for repairing stone chips as i've managed a few more on the bonet this weekend.