Oil pressure - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Build Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 04-25-2013, 10:33 PM   #1
Join Date: Apr 2013
Posts: 3
Oil pressure

Hey I gotta quick question for y'all. My jeep is full of oil but my oil pressure gauge say 20 it's not even to 40 is that strange?

zz01 is offline   Quote Quick Reply
Old 04-25-2013, 10:40 PM   #2
Supporting Member

WF Supporting Member
BCDonny's Avatar
Join Date: Jul 2012
Location: Squamish BC Canada
Posts: 718
how do you know your gauge is working correctly, check it with a gauge that can be mounted to the egine directly

BCDonny is online now   Quote Quick Reply
Old 04-28-2013, 06:31 AM   #3
Keymo's Avatar
Join Date: Jun 2012
Posts: 10,844
New flash: YJ (most early AMC and Jeep) gauges are not very "accurate"... Though I'd be willing to bet that your gauge is reading just fine.

Now, you COULD do as BCDonny said and outfit your YJ with all mechanical gauges and then you would KNOW FOR A FACT that your gauges are getting proper readings.... But read on...

As a matter of fact - the YJ oil pressure gauge should not be at "40" at all times.
At idle a large majority of people experience somewhere around the "20" mark... At highway speeds (or while accelerating) you should see and increase in oil pressure. As long as your gauge is "working" and hasn't pegged in either direction and your engine doesn't seem to be doing anything too funky - I wouldn't be worried about it at all.

The "Rule of thumb" (beyond idle) is roughly 10 PSI for every 1000RPM.

"NEWER" Jeeps (and vehicles in general) use "dummy gauges" on both oil and coolant and will usually stay around the 50% mark no matter what (unless something is really, actually wrong), even though in all reality at idle it will be much lower.

"OLDER" Jeeps (and a lot of older vehicles)show "actual" values and the oil pressure gauge fluctuates with RPM. Though the year cut off for when they moved to the "dummy gauges" varied from model and car manufacturer... Though, to the extent of my knowledge, ALL YJs had gauges that read "actual" values...
"The only true wisdom is in knowing you know nothing."
Keymo is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 11:47 PM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC