I've got a strange intermittent noise coming Fromm 2.0 tdi bkd engine it's kind of a marble sound from inside of the engine gearbox but only when it's warm ie long journey or city traffic the noise increases with the revs and is in time with the engine. No loss of power no smoke and no eng man lights and its clear on vag com. The car has had a clutch and a DMF about 2 years ago done about 15,000 miles in that time car has done 54,000 miles.
Any help much appreciated