oil pressure - Page 2 - JeepForum.com
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post #16 of 34 Old 07-09-2013, 06:17 AM
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But wouldn't it be nice to know for sure?


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post #17 of 34 Old 07-09-2013, 08:52 PM
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Do you think my low to 0 oil pressure could make my high end horse power go down cause after 65 mph I have like no hp
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post #18 of 34 Old 07-09-2013, 08:55 PM
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It is hard to get it above 70mph without keeping it floored for a while
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post #19 of 34 Old 07-09-2013, 09:09 PM
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But wouldn't it be nice to know for sure?
Yes it would if your willing to do a complete teardown, anything short of that is a crapshoot.
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post #20 of 34 Old 07-09-2013, 09:50 PM
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Complete tare down as is main bearings and rod bearings an what else???
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post #21 of 34 Old 07-09-2013, 10:04 PM
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Complete tare down as is main bearings and rod bearings an what else???
No, main & rods is a fairly easy crapshoot and can be done without pulling engine. Possibilities that require teardown are cam bearings,lifter bores and block/oil galley inspection. There have been horror stories of 2000 & 2001 4.0s being completely rebuilt and still end up with low oil pressure.
That is why I say if it ain't knocking and is running great it might be better to leave well enough alone.
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post #22 of 34 Old 07-10-2013, 05:47 AM
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Yes it would if your willing to do a complete teardown, anything short of that is a crapshoot.
But has it been checked with a mechanical gauge yet? That's what I'm getting at. POS oil filter on there? Kinda big jump from believing a crappy gauge to rod and main bearings to engine overhaul, isn't it?

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post #23 of 34 Old 07-10-2013, 06:22 AM
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Ya is a pos STP filter. What filter and oil is best for this engine? And where can I get a gage to test the pressure with out buying one. Can I rent one from auto zone? And were do I hook it up at?
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post #24 of 34 Old 07-10-2013, 06:53 AM
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Ya is a pos STP filter. What filter and oil is best for this engine? And where can I get a gage to test the pressure with out buying one. Can I rent one from auto zone? And were do I hook it up at?
Like I said in an earlier post, put a Wix or Mopar on there. You can rent a mechanical gauge from many auto parts stores, call some near you to see if they have one available. You attach it to the same port the oil pressure sender attachs.
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post #25 of 34 Old 07-10-2013, 07:03 AM
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Change JUST the filter to a Wix, Napa Gold or Mopar before going any further.

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post #26 of 34 Old 07-10-2013, 09:07 PM
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OK I'll do the filter. But for my next I'll oil change what is good oil for 106000 miles
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post #27 of 34 Old 07-10-2013, 09:14 PM
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OK I'll do the filter. But for my next I'll oil change what is good oil for 106000 miles
Whatever the manual says. Ditch the POS filter and go from there.

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post #28 of 34 Old 07-10-2013, 09:20 PM
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I don't have a manual. Shouldn't I put like some Lucius high milage oil or something in it if I want the engine to run real smooth and good and longer. I mean if you say not to use some pos filter then I shouldn't use just some oil that's just the number thing the Manuel says. Maybe a fully senthetic?
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post #29 of 34 Old 07-10-2013, 09:22 PM
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OK I'll do the filter. But for my next I'll oil change what is good oil for 106000 miles
You're going to get as many answers as there are members of this forum. The 4.0 isn't real picky about oil. The later models say use 10w30 or 5w10 if its going to be real cold. Some of the older models' manuals suggest 10w40.
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post #30 of 34 Old 07-10-2013, 09:26 PM
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I don't have a manual. Shouldn't I put like some Lucius high milage oil or something in it if I want the engine to run real smooth and good and longer. I mean if you say not to use some pos filter then I shouldn't use just some oil that's just the number thing the Manuel says. Maybe a fully senthetic?
I use full synthetic high mileage oil, works great for me. Others will have their own opinions. The "Bob is the oil guy" site is your friend and teacher. There are several threads regarding the 4.0 on that site.

Last edited by playbass; 07-10-2013 at 09:41 PM.
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