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Old 03-17-2012, 11:45 AM   #1
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Red face 1995 Wrangler YJ 4.0i - which engine oil?

I can't find my handbook , what viscosity do I need for a 4.0i from 1995?

Thanks very much

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Old 03-17-2012, 12:11 PM   #2
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10w30 or 5w30 depending on climate.

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Old 03-17-2012, 02:11 PM   #3
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Awesome reference Master4th

Brand wise, I just tried Royal Purple in mine. With the same weight motor oil as I was running before, there is a 10-15 psi increase in oil pressure. Runs smoother too, very pleased.
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Old 03-17-2012, 06:11 PM   #4
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Quote:
Originally Posted by The Toolman View Post
Awesome reference Master4th

Brand wise, I just tried Royal Purple in mine. With the same weight motor oil as I was running before, there is a 10-15 psi increase in oil pressure. Runs smoother too, very pleased.
I only use Royal Purple Lubricants, Diffs, Transfercase Trans everything. I gained 2mpg just by doing the diffs and trans. Less drag from turning gears equals more gas mileage!
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Old 03-17-2012, 06:14 PM   #5
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I wont ever run syn in my axles, currie did a study saying it actually increased tempuratures in the housing and my buddy who does diffs for a living won't warranty anything that has run in it.

But I do use RP Max-EX p/s fluid
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Old 03-17-2012, 10:03 PM   #6
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I always run Rotella in my 4.0's.

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