Hi, Not sure whether anyone can help or has come across this problem before. I have a 2005 55 plate A3 Sportback 2.0 Tdi 138hp, it runs absolutely perfectly under normal conditions but occassionaly I have to tow and this is when the problems start. After I have been towing for 20 miles or so the engine gets very noisy, sounds like a top end rattle. When this happens there is no engine management light or oil pressure light on, and once the engine has been stopped for 15 minutes or so it quietens down again. My car has only covered 40k miles and has a fsh, have tried fully and semi synthetic oil but it made no difference. Any help would be much appreciated, Cheers, Neal.