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What is normal oil pressure for a 4.0?
CF Veteran
Joined: Feb 2010
Posts: 12,367
Likes: 23
From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
CF Veteran
Joined: Dec 2010
Posts: 6,880
Likes: 0
From: Frederick, Maryland
Year: 1996
Model: Cherokee
Engine: 4.0 I-6 High output
CF Veteran
Joined: Mar 2009
Posts: 8,712
Likes: 2
From: Loomis,California
Year: 1987
Model: Cherokee
Engine: 242 inline six
I use napa 10w/30 and napa gold filter,get 60 psi cold at highway speeds,45 psi warm at highway speeds,around 25 to 40 at idle depending if its warmed up or cold
Thread Starter
Junior Member
Joined: Oct 2011
Posts: 80
Likes: 0
From: Conway Arkansas
Year: 1991
Model: Cherokee
Engine: 4.0
Thanks, just making sure I was not crazy. My wrangler oil pressure gauge did not work and other than that I have only had fords, they run low pressure all the time.
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CF Veteran
Joined: Oct 2011
Posts: 1,268
Likes: 1
From: Bakersfield CA
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
60 to 70 when cold, once it warms up 40, all at idle. when driving 65 to 70 is normal. asked a chrysler tech about this once he said that it was normal.
Seasoned Member
Joined: Jun 2010
Posts: 448
Likes: 0
From: Charleston, SC
Year: 1990 - 2000
Model: Cherokee
Engine: 4.0
When I start my jeep cherokee starts up its at about 17 psi and idles around the same. While running it goes up to about 22-24 psi. It has not given me any problems. Is the psi ok or do I have a problem?
CF Veteran
Joined: Dec 2012
Posts: 4,169
Likes: 6
From: York, PA
Year: 1998
Model: Cherokee
Engine: 4.0
Mine jumps all around, i've seen it around 20 and jump to around 50 but never higher than that. I'm running 5w30 and a Fram filter as well with zero issues.
Just curious--I see that everyone is running 10w30 on this post. Is there any specific advantages? my daddy always taught me to use 5w30 in most things
Just curious--I see that everyone is running 10w30 on this post. Is there any specific advantages? my daddy always taught me to use 5w30 in most things
CF Veteran
Joined: Aug 2011
Posts: 1,994
Likes: 8
From: San Jose
Year: 89
Model: Cherokee
Engine: 4.0 I6
Mine jumps all around, i've seen it around 20 and jump to around 50 but never higher than that. I'm running 5w30 and a Fram filter as well with zero issues.
Just curious--I see that everyone is running 10w30 on this post. Is there any specific advantages? my daddy always taught me to use 5w30 in most things
Just curious--I see that everyone is running 10w30 on this post. Is there any specific advantages? my daddy always taught me to use 5w30 in most things
"Maybe a little lighter in the summer, thicker for winter, or higher mileage vehicles "---- Do not quote me on that, do more research if you're really interested.
Common misconception is that the w stands for weight, it means winter, but really means the low temp viscosity, next number is the higher operating temp viscosity.
Never seen an issue with using 5-30 over 10-30 or vise versa. I feel like my engine is happier with the 10-30 though. Although I did just thoroughly clean my pan and pickup tube... who knows

My oil pressure is about 15-20 at start up and about 50-60 on the throttle, when it warms up it idles at around 40, still 50-60 on the throttle.




