Lifter noise in 98 Jeep Grand Cherokee 4.0L

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Did some searching through the forum, thought I found an answer, but that didn't pan out as well as I had hoped. Just bought a 98 Jeep Grand Cherokee with the 4.0L engine, 86K miles. Didn't have any piston slap/lifter noise when I bought it. I changed the oil a couple days after I bought it with Quaker State High Mileage 5w-30/Fram PH16 filter. Then I had lifter noise. Searched around here yesterday, and then last night I changed it again with Chevron Delo 15w-40. Helped a bit, but I still hear it. Any ideas on what I can add to help quiet the lifter noise? My 91 Cherokee with 200K does it and sounds like a diesel engine its so bad, I don't want this one going that route so soon. Thanks in advance, sorry for the long post.
 
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Also bullitt9350, if it is a sticking lifter caused by the build-up of crud in the lifter bores, you'll want to give the extra detergents in the gas/diesel oils more time to work. --- Bror Jace
 

bullitt9350

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Thanks for the replies. I'm getting ready to swap out the engine in the 91 for a 4.7L stroker I built so I'm not too concerned about it. The new engine will run synthetic as soon as the break in period is over.
 
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Auto-RX worked great on my son's Jeep, quieted down after a few hundred miles, fine through rinse and then Syntec 10W-40..
 
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