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Did a bit of a search but cant find a thread specific to the issue we're having with our 2013 ZD30 GU.
A couple of months ago we had to replace a faulty alternator and in the process noticed it was covered in carbon soot. The diagnosis at the time was that the intake hose into the turbo was loose. We tightened down the clamp and it helped somewhat but we seem to still have soot buildup.
Engine is stock other than a Steinbauer and has very low mileage.