Q: pcv valve replacement on 2003 BMW 325xi

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how do you change out a pcv filter?
(1) Answer
Normally the intake manifold has to be removed to get access to the breather / oil separator assembly (PCV valve). I strongly suggest to get all the connecting hose replaced as well and use the updated "cold weather valve" upgrade.
I know some tech claims they could do it without removing the manifold, but it risky and could create problems.