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Old 07-24-2016, 10:30 AM
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New forum member, long time JK owner

I purchased my 2007 JK Unlimited Sahara new in the first few months the 4 doors became available. I love the functionality of my Jeep but the oil usage has become depressing. A compression test at 60k miles indicated 158-160 psi on all cylinders and the plugs didn't have the look of being from an engine using a quart every 1200 miles. I have searched but have not found what the psi reading should be on a new broke-in 3.8L engine but some engineering info I found indicates it should be close to 200 for the bore and stroke of the Jeep engine.
I failed to do a wet compression test when I got the 158-160 results because the JK factory repair manual listed a minimum of 100 psi as acceptable.
Now at 88K miles the JK is up to using a quart in 600-700 miles.

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Old 07-24-2016, 11:57 AM   #2
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Because this is the newbie check-in area, you may not get the answers you are looking for. I suggest you check out this forum area and post your questions there, I think you'll get a better response.

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Old 07-24-2016, 10:11 PM   #3
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Old 07-25-2016, 03:44 AM   #4
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Old 07-27-2016, 05:07 PM   #5
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