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My '91 has a new engine, but they used the old head without a rebuild. I had some lifter noise, which is normal with the 4.0. Recently it became a little noisier, and I drained a pint of oil, replacing it with a pint of Marvel Mystery Oil. Within 30 miles it was much quieter. From what I understand, MMO has solvents that clean out the gunk that cleans out the passageways in the lifters allowing them to maintain pressure. I would bet that almost any lifter solvent/cleaner would do the same thing. I use MMO because it's worked for me before.

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โˆ™ 2008-05-08 16:06:49
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Q: What is the best was to quiet lifter noise on a 1991 Jeep Wrangler with a 4.0 engine?
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