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How do I know when to replace my PCV valve. Is oil supposed to get past through it or not? Seems like some oil gets past it into intake manifold (my daily driver 93 Mazda)
 

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Used to be they got replaced with every oil change or at least that what was recommended.
If it is drawing oil, your getting excessive blowby or possibly the baffle is missing under it.
 

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If you have after market valve cover's,Make sure you have a baffle in it...This is something most people don't catch.And in most cases,this is the problem...You shouldn't be getting oil through it.. :)
 

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It should open at a preset value, either vac or pressure, so it only operates as needed. They aren't expensive so I would replace it just because. If it still draws oil, see first response. :)
 
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