Originally Posted by Shmoo

That is backwards. Air is pulled into the valve cover from the intake and then moved into the crankcase and then pushed out the PCV valve and then into the intake manifold. There it burns the oil vapors from the crankcase off.

I removed my hose because the turbo was sucking oil into the compressor wheel through it instead of supplying it air. The pressure differences in the crankcase because of that can attribute to poor ring seal.