Guy Gene,
FWIW: On my high mileage 2008 CC 4wd with 5.3, etc.: truck used to burn oil like they all seem to do. After reading up on the issue I went old school to confirm: I ran a compression check on all 8 cyl. (with AFM, I considered only checking 4, LOL). All cylinders were high and even, therefore rings were good. The topside was the culprit, I changed valve cover to get new PCV design and disabled AFM. No can was installed. ALL oil consumption stopped, like nearly zero. I do not have to add oil btwn changes, and its been like that for over 100K miles. I did not have to add "can", that seems to only treat the symptom, i.e. catch the oil vs stop the leak.
I have been very pleased with the 2nd life in the truck. She likes running on all 8 cylinders all the time, gas mileage has not changed, oil stays in crankcase, computer tweak got the govt out of the engine. She actually runs better today than 4.5 yrs ago when I got it with 99K.
Daily Driver - 353K