I had allot of pinging in my 01 5.2 ram. I put a plastic overflow bottle between the PVC and the throttle body. You wouldn't believe the water and a little bit of oil in there after 3000 miles. I know the engine had some blow by, but it was unbelievable the difference in performance.

These engine have so much vacuum, I guess, that they pull any crap they can thru the valve cover into the throttle body.

They work, I just got a 11 ram pickup with the 5.7, so I will pay attention to what it needs. Seems a shame you have to fix a problem the factory knows is there.