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Old Sep 10, 2015, 03:36 PM
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What is normal oil pressure for a 4.0?

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Old Nov 1, 2017 | 01:23 PM
  #31  
Tony the Liger's Avatar
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Model: Cherokee
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Stopped in to ask about this, too.

Is there a standard pressure for XJs? I haven't had mine long and have driven it very little, but mine seems to be on the low side when idling (in the 13 range, as mentioned above) and close to, maybe even topping, 40 on the highway.

Is this normal? I've worried that it's low, but I don't know what's standard.
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Old May 5, 2018 | 10:57 AM
  #32  
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Model: Cherokee (XJ)
Default 4.0 oil pressure

I have a 99 Grand Cherokee,Laredo.With a 4.0 high output.She has 246,000 on her.And my oil pressure is 40 lbs at idle.And 60lbs at highway speeds.Is that good?
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Old May 5, 2018 | 12:59 PM
  #33  
dr.zoidberg's Avatar
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From: Lawrence
Year: 1997
Model: Cherokee
Engine: 4.0 straight 6
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My 97 xj sport with 203,000 runs 5w30 rotella t6 with k&n filter. Runs about 17psi at hot idle. About 25 psi at normal idle and 50psi runnin down the road

Last edited by dr.zoidberg; May 5, 2018 at 01:02 PM. Reason: Spelling error
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Old May 5, 2018 | 07:03 PM
  #34  
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Model: Cherokee (XJ)
Default My 99 Grand Cherokee,4.0

She runs at 40 lbs at idle.And 60 lbs at highway speeds. (2000 +rmp) Running Modil 5w30.With 246,000 miles on her.Is my 4.0 a healthy motor?
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Old May 5, 2018 | 07:28 PM
  #35  
EEVEE's Avatar
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From: Florida
Year: 1999
Model: Cherokee
Engine: 4.0l
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210k miles with pennzoil 10w30 high mileage synthetic blend and wix filter.

Cold idle: 45 psi
Cold at 1500 rpms to 2200: 65 psi

Hot idle: 15 to 20 psi
Hot at 1500 to 2200 rpms: 35 to 40 psi

Also with mobil 1 conventional decrease all psi by 1 to 2 psi and a crappy white oil filter from a quick lube place
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