Normal Oil Pressure? 1999 XJ 4.0
06-27-2018, 08:15 PM
#1
Newbie
Thread Starter
Join Date: Jun 2018
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0
Normal Oil Pressure? 1999 XJ 4.0
I’ve seen posts saying that above 13psi is good, and mine gets to about 20-25psi at the lowest when its warmed up. I have only 45k miles on it though, so I was concerned if this was normal pressure for such a low mileage engine. Maybe 20 at hot idle is ok for a more worn in motor and maybe a sign of a problem in a lower mileage one? I run mobil 1 synthetic 10w-30, puralator oil filter, and have been driving in Florida summertime temps.
06-27-2018, 10:02 PM
#2
Senior Member
If you're reading pressure from the dash gauge those are not known for accuracy. You'd need to check with a good mechanical oil pressure gauge for accurate readings. Others can chime in but that sounds like decent enough hot idle pressure to me.
If there's no antifreeze getting in the oil (get an oil analysis if concerned) and no bad noises I would not spend a lot of time worrying about it.
If there's no antifreeze getting in the oil (get an oil analysis if concerned) and no bad noises I would not spend a lot of time worrying about it.
The following users liked this post:
sharondchurchill01 (02-16-2024)
06-28-2018, 02:14 AM
#4
CF Veteran
Join Date: Oct 2015
Posts: 7,357
Likes: 0
Received 1,531 Likes
on
1,173 Posts
Year: 2000
Model: Cherokee (XJ)
In my '00, with about 160K, I get about 45 to 50 at start up. Goes down to about 23 at a very hot idle and will go up to about 45 to 50 while driving at that point still. About to put a mechanical gauge on her some time in the near future to see what the actually reading is.
06-28-2018, 11:29 AM
#5
CF Veteran
Join Date: Nov 2017
Location: Groton, MA
Posts: 3,695
Received 234 Likes
on
207 Posts
Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
If the needle hovers between 20 and 60 during normal operation, you're fine.
13psi is the MINIMUM pressure. The typical hot idle pressure is more like 20-25.
If you're concerned, you can get a pressure gauge from Harbor Freight for around $20 or borrow one from a friend or parts store. (I'd gladly lend you mine if you were nearby). I think you're totally OK though.
13psi is the MINIMUM pressure. The typical hot idle pressure is more like 20-25.
If you're concerned, you can get a pressure gauge from Harbor Freight for around $20 or borrow one from a friend or parts store. (I'd gladly lend you mine if you were nearby). I think you're totally OK though.
The following users liked this post:
sharondchurchill01 (02-16-2024)
06-28-2018, 12:04 PM
#6
Newbie
Thread Starter
Join Date: Jun 2018
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0
Thanks for all the replies, it stays pretty much above 40psi at cruise. I’m probably worrying about nothing, but it doesn’t hurt to ask.
Thread
Thread Starter
Forum
Replies
Last Post
hbracing13
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
8
04-26-2016 05:33 AM
Xj88
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
35
12-23-2014 09:39 AM
AZcreepycrawler
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
4
02-09-2010 10:44 PM
auburn4193
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
17
02-02-2010 02:51 PM
Jeep Guy
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
4
07-13-2009 09:34 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)