Quote:
Originally Posted by Joe2.0E
I also think the diff is most likely given the noise has just started suddenly. A wheel bearing wil gradually get nosier unless the bearings suddenly collapse.
I have similar miles on a D4 3.0TDI without any issues but i dont have the sports diff. My previous D3 had one rear wheel bearing replaced after a similar droning noise but it was at about 150k miles.
If you are out of warranty, it would be worth having the diff oil changed, condition of the old oil might indicate if the diff is in trouble. Shouldnt cost much to have it done.
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The bearing on my D3 started groaning clear as day one day, parked it up after a 200 mile drive, no noise - came back a few hours later to drive home, groaned all the way home. Was like that for a few 1000 miles until I isolated which bearing and got it booked in, my initial worry was the diff!
That said, oil change won't hurt and may as you say tell a story!