hi im no mechanic but im alrite with basic stuff,yeah its 2.7tt 99 model,the cars done 130k do you think the rattle will be worn runners or worn spring milage related?i had a audi spiecalist listen to it he said do not worry to much about it and keep driving it but since then the rattle has got louder,im not convinced hes the best mechanic either,you probably know yourself wen you hear a noise on your car it must be fixed, im paranoid incase the chain slips a tooth coz chain will not be under full tension and will not be cheap to fix if it slips,the car drives mint and noise goes away above 1500 rpm,do you think im best off getting the part direct from audi?