E46 330d Turbo/burning oil issue
Got my turbo rebuilt and refitted it using a new gasket. Crank breather, oil and filter were changed too. Return and feed pipes were blown through and new gasket on the return pipe fitted.
All was well for a couple of weeks then noticed smoke when pulling away from lights or after sitting at idle. Had the car on a ramp getting geometry done and there is oil dripping from the join between the down pipe and hot side of the turbo.
The turbo rebuilder has checked the turbo without removing it and says it is fine. He said oil is returning up the return when on idle and the easiest path is through the hot side into the exhaust. He said where the return goes into the block there is pressure where it should be under vacuum. He has suggested pulling the rocker and checking for an obstruction but my mechanic who is a BMW specialist says this is unlikely to be the problem.
Anyone come across this before?