Maar de CCV problemen zijn zeer vergelijkbaar en hoofdoorzaak olieverbruik.
Van het internet N52 specifiek:
You can check the CCV diaphragm by disconnecting the small vacuum hose that runs over the intake to the throttle body. Disconnect the hose at the throttle body, with the engine off, and see if you can pull vacuum. If you cannot the diaphragm has failed. If the diaphragm has failed it will not close off at idle and expose the crank case to full manifold vacuum. That can increase oil consumption through the intake.
I changed my entire CCV on my N52. My diaphragm was broken and the cyclone inside the oil separator was clogged so oil was going directly into the intake