TDI, A8 3.0T, A8 4.0T, Q5 TDI, and TT RS) Ribbed V-belt - Replace only the belt for the compressor drive (front belt) all vehicles with the 3.0L V6 TFSI (except S4, S5, and SQ5) 4) The air cleaner replacement at this interval includes the S8 4.0L V8 TFSI engine. Perform at 60,000 miles or 6 years, whichever occurs first. Sep 17, 2015. #7. desertstorm said: All the 3.0 TDI engines are cam chains that are designed to last the life of the car. I don't think there is a recommended change interval. They live at the back of the engine so replacement is an engine out job and is not cheap. Typically they seem to be good for 180-200K miles. 4RKe.