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Unread 07-10-2013, 09:40 PM   #31
BIGBADWOLF
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2004 WJ 
 
Join Date: Aug 2012
Location: Charlotte, North Carolina
Posts: 417
Quote:
Originally Posted by brettgorringe View Post
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?
For your climate 15-40 and the 4.0 go together like peas and carrots!

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Unread 07-10-2013, 10:26 PM   #32
xjdantheman
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1993 XJ Cherokee 
 
Join Date: Mar 2013
Location: overland park, ks
Posts: 210
i used quaker state defy 10-30 with good results level never seemed to run down. rotella 15W-40 seems to burn up quicker for me.

i have bad valve guide seals and a low end tapping noise i suspect as a cracked flexplate.

i also have low pressure at idle when warm.
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Unread 07-19-2013, 05:39 PM   #33
brettgorringe
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2001 XJ Cherokee 
 
Join Date: Jul 2013
Location: tooele, ut
Posts: 45
OK guys so I replaced the the oil filter with a Mopar one and it surprisingly did help a little. I know my next step is to test the oil pressure manually but untell I get around to doing that is there anything else I could replace first?
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Unread 07-19-2013, 09:43 PM   #34
cruiser54
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
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Quote:
Originally Posted by brettgorringe View Post
OK guys so I replaced the the oil filter with a Mopar one and it surprisingly did help a little. I know my next step is to test the oil pressure manually but untell I get around to doing that is there anything else I could replace first?
Not surprised at all. Drive it for a bit, but check the pressure first chance you get.
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