You may also wish to upgrade theBMW N54 Rob Beck PCV Valve Screw-on Cap. The solution will only fix the OEM PCV valve itself and not a leaky valve cover gasket, which is also a very common problem on the N54 Engine.
50mm BOV Intake Turbo Charge Pipe Kit For BMW N54 E88 E90 E92 135i 335i 335xi
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