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Yeah I mean someone hasn't done something correctly. Could be as simple as duff valve stem seal, or not fitted perfectly or even the little spring has popped off the seal.
Recently came across a specialist vw guy who only sold used vag cars, unfortunately he didn't seem to know much about them despite saying he was a vw master tech for 18 years! When I asked if he could put one of the cars I was looking at on ODIS to verify the dpf wasnt totally clogged he said wtf is that, never heard of it before...
Not taking the piss here, genuinely don't get it.