Pcv is a one way check valve. You should be able to blow air thru it only one way.
have you checked the oil cooler valley?
I second this. I already went through this. There was no visible leak until it finally gave way but the oil filter housing was leaking. I replaced it a year ago and no leaks since. Another thing to do is to looked near the PCV valve down to the side of the the 02 sensor(passenger side towards the tire) and look for burning oil. Maybe where oil spilled from changing the oil or something. My PCV valve was gone so I changed it also when I was chasing codes. The PCV was needing changing but my issue was a fuel injector which has been fixed. I had a burning smell and it went away when I carefully sprayed simple green and carefully pressued washed the area. I need to scrub that area with a scrubbing cloth as the oil burned on from when the oil filter housing leaked and although it was replaced, I didn't clean it well enough. Here is a pic of my culprit. When I remove the tire, I’ll get at it better and scrub the crap out of it with a degreaser.
How many miles within that half a quart? Half a quart isn’t much and within a tolerable range if it’s anything over 1k miles
