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You need to goto jeepstrokers.com, you are probably looking at a wiped cam lobe. When they removed the zddp from the oil, many people were only getting about 30K miles before the cams went to [Edited by Moparts - Family Friendly Site - Keep it clean]. When you have the pan off, check the cam from the bottom. Been there and done that. Tim

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I was contemplating on pulling the valve cover to
determine which lifter it is and checking the lift
of the lobe... this is my plan of attack, 1) find
the problem lifter, 2) check lobe lift, 3) if ok, then
pull the pan and check the pump, 4) if need be, change
the pump, 5) then see if the head needs to come off
to change the lifter(most likely change them all)