One thing I've learned (the hard way) is that jeeps are kinda fussy about the lines to and from the valve cover. Mine used to blow a quart of oil every 2 weeks till I fixed it. The thing is to keep the lines absolutely clean on the inside, and make sure they are very tight. I ended up replacing all the rubber lines on mine with new ones, its cheap and easy. That fixed it because the thing won't breathe the crankcase properly unless it has a pretty strong vacuum. My lines were old and stiff and loose, the new ones are new and tight.
IIRC I used 5/16ths vacuum hose on the small front line - that fixed it, only 89 cents a foot.
Try NAPA for your parts, I've had the best luck with them. They seem quite knowledgable and have everything. If your PCV rattles when you shake it, its still good. Sometimes you can clean them out by soaking in gas.
Hope that helps!
Last edited by oldtime_ironman; 08-20-2011 at 01:57 PM..
Reason: helpful details