Whats an Acceptable Engine Oil Temperature (EOT) - Ford Powerstroke Diesel Forum
Please Visit our Site Sponsors
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 04-05-2012, 03:58 AM

Join Date: Nov 2011
Posts: 40
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Whats an Acceptable Engine Oil Temperature (EOT)

I did the head gaskets on my truck back in Dec of 2011. I didn't replace the oil cooler at that time. The truck has runs good since I did the head gaskets. Back in Jan, I got a scan guage for this truck. I did a trip to NY with this truck and noticed the EOT was running about 225-230 degrees. So last month I picked up a new oil cooler on craigslist on the way back from NY. I did a coolant system flush last month before changing the oil cooler. Around Feb 15th I changed out the oil cooler. After I changed out the oil cooler I noticed the EOT were ranging from 193-196. Last week I made a trip to Lubbuck and somewhere around Breckenridge the wrench light came on and showed Oil cooler efficiency monitor - DTC P012F code. The EOT was at 203 degrees and the ECT was showing 192 degrees. Never before has this wrench light come on. I noticed it was a little low on coolant, but couldn't find any leaks. I was running the truck about 75 MPH. I topped off the coolant and the coolant level hasn't changed since I topped it off. Normally running the truck around town I getting 196 degrees on the EOT and the ECT ranges from 183-192 depending on how I'm driving the truck. The truck has a new thermostat also. Are these Engine Oil Temperatures acceptable? I guess the answer to this question varies alot depending on who you talk too.
Reply With Quote Quick reply to this message
Sponsored Links
Old 04-05-2012, 04:27 AM
Compression Ignition Addict

Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,108
Thanks: 0
Thanked 25 Times in 23 Posts
Feedback Score: 0 reviews
11*F isn't a terrible delta, but could be lower. You running a coolant filter?
Not sure why the light came on.

BTW, I can tell you're from Texas. Where at?
Reply With Quote Quick reply to this message
Old 04-05-2012, 05:05 AM
Compression Ignition Addict

Join Date: Jul 2011
Location: Houston, TX
Posts: 264
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Those numbers sound fine to me. I usually run 190-195 ECT 195-205 EOT around town.

If you're using AC, your ECT (and EOT) will actually be cooler than if you're not (might explain NY/Texas disparity) as the AC causes your fan to run 100% of the time, whereas without AC, it only turns on and off as needed.
Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel 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:
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
Display Modes

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 On
Pingbacks are On
Refbacks are On

All times are GMT -8. The time now is 05:41 PM.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.