Engine Oil Temp vs Engine Coolant temp - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 07-28-2019, 04:27 PM Thread Starter
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So I finally got an Edge CTS2 monitor setup on my 03 F350 6.0 Powerstroke. Running around town my EOT is running around 226 and highway driving it’s getting up to 246 and my coolant temps are 188- 190 .

Truck was a 1 owner with 103k miles always dealer maintained. I’m assuming my oil cooler is plugged and looks like I’m gearing up for an EGR delete and new oil cooler.

Do you think flushing the system will help this 56 difference in temps or not even bother flushing and just do the oil cooler replacement and EGR delete? From what I understand temperatures should not differ by more than 25.
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post #2 of 16 Old 07-28-2019, 04:31 PM
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The limit is 15 degrees.

Flush it well and change to an EC-1 rated ELC coolant (ie get rid of the Ford Gold).

Then you still may need to put in a new OEM oil cooler - but before doing that you need to get the system as clean as possible w/ the right coolant.
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post #3 of 16 Old 07-28-2019, 05:53 PM Thread Starter
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Originally Posted by bismic View Post
The limit is 15 degrees.

Flush it well and change to an EC-1 rated ELC coolant (ie get rid of the Ford Gold).

Then you still may need to put in a new OEM oil cooler - but before doing that you need to get the system as clean as possible w/ the right coolant.
I’ll start by doing this and see what happens thanks Bismic
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post #4 of 16 Old 07-28-2019, 06:52 PM
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Check the EOT and ECT after the engine has been off overnight or longer to see if they read the same temperature -- may just be a sensor problem -- the sensors are the same, could also swap them around to see if the temps follow
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post #5 of 16 Old 07-28-2019, 07:05 PM
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If you end up changing the oil cooler, make sure you also flush the radiator as well... My radiator was flaking off trash no matter how much I flushed it and I ended up replacing it. The price of a new radiator is cheap in the grand scheme of you situation. Been there done all of that and got a hell of an education the hard way.. My temps are now 3-5 delta around town on on the highway and 8-11 towing... I am very happy with mine now, but I had to go through the pain... LOL

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post #6 of 16 Old 07-29-2019, 09:39 PM
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With temps that high just highway driving, flushing will not fix it enough. I would replace the cooler.

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post #7 of 16 Old 07-30-2019, 05:46 PM
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A good backflush will likely improve the situation, but yeah, I'd expect needing an oil cooler replacement.
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post #8 of 16 Old 07-30-2019, 05:58 PM
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Just flush it real good before you tear it down, you don't want to clog the new one. And if it's going back in the valley don't get a cheap aftermarket cooler. New OEM is about $300 at WBL @fordsvtparts can hook you up.
BTW open both block plugs when you flush it, a Fumoto F108N behind the starter makes it so you only have to drop the starter once.
Cat EC-1 spec ELC when you reassemble Cat, Rotella, Delo, and Texaco are all OK. Don't get 50/50, you'll need concentrate. And when you clean the oil reservoir under the oil cooler use microfiber rags so you don't leave lint behind. You don't want to have to pull the IPR when you're done cause you let lint get thru.
DTR has a good video of a BPD EGR cooler and OEM oil cooler job. Just do your delete and ignore the EGR replacement. even if you've been in there before it's handy reference.

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post #9 of 16 Old 07-30-2019, 08:52 PM
 
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Lot's of good advice here!

https://parts.autonationfordwhitebea...it-3c3z6a642ca
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We are Autonation Ford of White Bear Lake selling all OEM Ford parts at employee prices (formerly Tousley)

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post #10 of 16 Old 07-31-2019, 03:05 AM
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If your ECT doesn't exceed 190* at any driving condition........you need a tstat first.



After all that oil cooler work to have the same delta "problem" would be a headache cause spending more money than you need to could have been avoided.
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