So I had my oil cooler replaced @ 89k miles. Now I am at 136k miles. Oil coolers don't go out that fast do they? I had one from Ford installed, what I don't understand.....is my ECT/EOT delta is anywhere from 12* to 22*. The fan clutch is ALWAYS on. I checked coolant levels, I don't have oil in coolant, coolant in oil. I don't understand. My coolant level doesn't move. However I can be just moping along and my EOT/ECT while UNLADEN is 15*. I have my EGR deleted. But that shouldn't cause THAT big of a problem. Any suggestions guys?

 

Do you have a coolant filter installed? Are you using Ford "Gold" coolant? Are you changing it often?

If you are using Ford Gold coolant, and haven't changed it in awhile, and you don't have a coolant filter, you may need a new cooler again.

Most people here do the following when the delta reaches where you are at.

Flush with VC-9
Change oil cooler
Install bypass coolant filter
Change coolant to ELC
Check/change coolant regularly

People who do this rarely have problems afterward.

 

What are your actual ECT and EOT numbers?

 

Both posts above are right on the mark.

Yes, your oil cooler can be clogged again. It all depends on how well the coolant system was flushed during the previous cooler swap.

I did what ThorsHammer posted and followed to instructions in the tech folder for flushing out the coolant system. But like posted above it would be good to know the actual temp readings as well to verify the sensors are operating correctly as well as the thermostat.

 

I know the shop. He flushes it really well. Then somehow back flushes the engine. Pictures of Torque Pro while laden and unladen on the way

 

after 12 hour cold soak upon startup check ECT-EOT-TFT for consistency all should be same or really close


maybe you did this IDK

 

So when I'm towing my 9k lbs camper. I see ECT of 218* and EOT of 238*

 

I did. So my difference is 5*. My EOT was 5* warmer.

 

I did oil cooler at 73K on mine


Im now at 135K and just did another oil cooler


First was casting sand plugged
Second look like the Protection layer from the Gold came out


It was clearly plugged with 2 different substances


Each time I flushed very thuro

 

Testing has to be done unloaded truck only to get rid of any load inconsistency one truck to another




But when pulling the 15* kinda goes out the window BUT you can watch and see if the EOT is droping say after a Grade or when stoped at a Light


With a Loaded truck you will look at the ability to cool oil and not go by a Dead set Tolerance of 15*


If EOT goes High and Always REMAINS High ( Such as stopped or descending a grade)it is plugged the Ability is no longer there

 

Your temps while towing don't mean much, what are they unloaded while driving @ 65 on level freeway for 20 minutes or so. That's 20 minutes after it's up to full temp.

 

The oil definitely cools down. Went from 238* to 213* coming down a 6% g grade that was 7 miles long.

 

sounds good to me


20* spreads pretty good pullen


its cooling fine

 

Are you running any performance tunes? What type of coolant are you using?

 

After rereading the thread again this is the part that still concerns me a bit. Like suggested above, I would do the 65 mph unloaded test and do some data logging with Torque Pro for some piece of mind.

If you data log, ECT, EOT, RPM, & speed we can graph it up and get a better understanding.