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Question
Hi, I have two jeeps.  1993 Grand Cherokee with 6 cyc. and a Jeep Wrangler 1995 with a 4 cyc.
I decided to change my oil on both this last time with some synthetic Mobil one and now both have a "tappit" click noise as if the hydrolic lifters are not work right.  Neither one sounds like all of them but just maybe one or two. I have been told that this is normal.  Both engines are up around 140K miles.  Anything to worry about?  I added some STP to see if that would "thicken" up the oil but did not make much difference.  Both run strong.  I have also heard that run a quart of tranny fluid in the oil for awhile to pump up the lifter.
Any thoughts?

Answer
Hi William,
I have to admit that I don't have any advice other than to inquire about the "weight" of the synthetic oil as compared to what was the weight you had been using. It could be that the pressure is lower in the system which is why you are experiencing the lifter sounds.
Roland

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Roland Finston

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Free fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

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Five decades as a 'do-it-yourselfer' on domestic and imported cars

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Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

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Degrees in Physics/bruised knuckles.

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"Top expert" of 2010, 2011, 2012, 2013, 2014, and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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