Renix factory oil pump life
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Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Thread Starter
CF Veteran
Joined: Feb 2011
Posts: 3,074
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From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
and i know everyone does not have a crystal ball
but i did read somewhere that Renix oil pumps failed before any other oil pump for a 4.0 and i feel this has been disproved and i thank you everyone for your input knolwledge on the subject and 5-90 thanks for the gauge plug in idea... I'm going to try that as well put the guage in before and after...I change out the oil filter 
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Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I thank you everyone for your input... and i did just do an oil change so it most likely is the filter...
and i know everyone does not have a crystal ball but i did read somewhere that Renix oil pumps failed before any other oil pump for a 4.0 and i feel this has been disproved and i thank you everyone for your input knolwledge on the subject and 5-90 thanks for the gauge plug in idea... I'm going to try that as well put the guage in before and after...I change out the oil filter
and i know everyone does not have a crystal ball
but i did read somewhere that Renix oil pumps failed before any other oil pump for a 4.0 and i feel this has been disproved and i thank you everyone for your input knolwledge on the subject and 5-90 thanks for the gauge plug in idea... I'm going to try that as well put the guage in before and after...I change out the oil filter 
Senior Member
Joined: Jan 2012
Posts: 952
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Year: 2004
Model: Grand Cherokee
Engine: 2000 4.0
Most of the time when someone replaces an oil pump they are just pulling straws because it is more likely an engine wear problem. I wouldn't get too obsessed over oil pressure...it is what it is.
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Joined: Mar 2010
Posts: 47,923
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From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
I just crested 200,000 here still going strong around 20 at idle round 40 when cruising ...2010 chevy work truck same pressuress i think im good for a while...
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Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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Joined: Aug 2011
Posts: 10,489
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From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
No brainer, Stop Teenage Pregnancy, OR, Stops Them Permanently? Really though, STP saved my butt once to make it out of the valley over some hill to San Louis Obispo'. Unlikely I would have made it there to install new rod inserts in a 56 chevy step van, (in a sand lot in the wind), to then drive it 800 miles home, with about 5 pints. 
There was a big picture window with a florescent light in it with a 3 foot pyramid of stp pints, I could see a mile off, banging along at 17 mph (on the freeway), approaching the grade.
There was a big picture window with a florescent light in it with a 3 foot pyramid of stp pints, I could see a mile off, banging along at 17 mph (on the freeway), approaching the grade.
Last edited by DFlintstone; Dec 12, 2012 at 08:05 PM. Reason: ,
CF Veteran
Joined: Apr 2009
Posts: 18,786
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From: CT.
Year: 88
Model: Comanche (MJ)
Engine: 4.0 HO
I have 3 renix XJ'S. My 87 weekend warrior 200,000.
My 90 winter warrior 95,000.
My 89 larado 125,000
All 3 do not have this oil pump issue you speak of OP.
My 90 winter warrior 95,000.
My 89 larado 125,000
All 3 do not have this oil pump issue you speak of OP.
Thread Starter
CF Veteran
Joined: Feb 2011
Posts: 3,074
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From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0