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
It's hit or miss. Sometimes I notice hardly any oil consumption, and other times it comes on within about 400-500 miles (half a quart or so). I notice it's mainly worse on longer trips vs short jaunts around town. It's definitely under 1000 miles to lose half a quart. For example, I went on a recent 300 mile trip. Checked the oil before I left, and it was fine. Got to my destination and rolled around town for about 15 miles or so, and found it 1/2 a quart low. Filled it up, drove 300 plus back home, and it's holding steady with no loss.
I have a KandN in there that I oiled and cleaned about two months ago, and at the time it looked pretty good except some random leaves and stuff. Would there be oil and gas residue in there if the PCV is bad? Filter looked normal and not saturated that last time. I will have to pull it again this week and check it.
No not necessarily if the PCV is bad but if you had a bad motor.
If the PCV valve is bad (stuck open) then your engine will likely be burning a bit more oil. If it is stuck closed your engine may develop internal pressure and leak oil at any bad seal.
Half a quart in 1000 miles is normal and well within acceptable range IMO.
