Crankcase Vent Valve / Oil Separator - Genuine BMW - E9X M3

Integral part of the crankcase vent system.

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The oil separator is part of the crankcase vent system and is supposed to separate oil from the intake air. On the M3 S65 V8 there is a oil separator on each valve cover under the intake plenum. There are no moving parts to these oil separators - they rely on a cyclone effect to extract the heavier oil from the air and drain it back into the valve cover and eventually back into the oil pan. During any service work on the valve cover you should inspect and clean, or replace altogether, these oil separators so they work as efficiently as possible - excessive oil in the intake air will reduce engine performance.

This can be found on the CCV system of all 2008, 2009, 2010, 2011, 2012 and 2013 model BMW M3 (coupe, sedan and convertible). It's specific to the S65 V8 engine. 

Sold individually. Be sure to order two if you are replacing both of them at the same time. 

BMW Fitments:

3 Series
E90 / E91 / E92 / E93 (06-13) > M3
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