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Try replacing the vent hose at the back of the valve cover to the rear turbo inlet, pn 11 15 7 553 949. This pipe has a vacuum limiting valve that can go bad. Otherwise it's a bad turbo or bad valve stem seals, neither of which are cheap or easy. The vent pipe, however, is only $33 retail.
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RRT
E92 335i/6MT with stuff and things
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