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the turbo has an oil feed to it to keep it running smoothly, if the return is clogged the oil will have to get out somewhere, so that could be the easiest problem if it hasn't been doing it too long (I think), the bearings could be worn out, which will let oil past them, which will mean a rebuild or new one (expensive) or the crankcase pressure could be up, due to worn rings, causing the breather pipe that goes into the air intake to carry oil to the turbo (probably not too good)
some one else may be able to comment but that's all I can think of...
Trev
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