Flat highway driving, no towing, -5 to +5 Celsius (23 to 41 Fahrenheit) outside tempurature, my ECT's are 172-177 and my EOT's hover from 205 to 215, does this automatically point to an oil cooler replacement? Or are those ECT's too low and perhaps a thermostat problem? My current Motorcraft oil cooler has around 50,000 miles on it and was replaced around the 60,000 mile mark.
Thanks

 

First things first,you need a stat. I'm personally running the Misto stat,I running between 194-200 on the coldest days (minus 11 cold enough?) Then you can check your deltas at 65 mph on a flat road for about 10 miles.....then you will answer your own question

 

Alright, thermostat was replaced and ECT's have risen to 190-195, will monitor EOT's the next time i'm on the highway

 

Your fuel milage will rise and your truck will run better with the higher temps

 

Definitely a bonus, thanks

 

After some highway driving i'm seeing ECT's around 192 and EOT's around 210 to 220 and as high as 230 on some long uphill grades, where should I go from here?

 

Really good flush, EGR cooler and oil cooler.

 

Or EGR delete if you can.

 

It would seem you need to run as required, flat ground, 65 mph start with normal temps (fully warmed up) for about 10 miles. There is a link here someplace about the ford testing. As you climb hills you will see a rise in temps normally mine rune within 6-7* of each other and then will rise on hills and come back down normally but I think the key is flat terrain to measure

 

I deleted the EGR a few years ago so that's take care of. Would it be best to have the dealership flush the coolant?

 

Absolutely not. Unless they are going to do a thorough flush and not just replace the coolant. It will take the better part of a day to flush it right.

 

Alright thanks, i'll see if I can find a tutorial on how to do it properly

 

If you don't have the fumoto valves installed on your block, I would definitely consider getting them and installing them the first time you drain your coolant. There is a black drain on each side that you pull to drain the block. This should get you around and extra 3/4 to full gallon more coolant out of truck. When you flush, after reaching operating temps on second fill, i like to leave running hose in degas bottle and start truck with all drains open and rev up draining and refilling bottle several times to try to get ALL sediment out. I guess it worked for me, I also installed coolant filter and checked it after 1k miles and not a speck of trash on it. Fumoto valves make that process MUCH easier!

 

If your going to flush, be ready to do an oil cooler as well. Those numbers do show you are at the recommended split for an oil cooler.

Flushing with the chemicals will dislodge some stuff. A straight water flush probably wouldn't hurt, but with the spread you have now, I'd definitely be ready to do a cooler.

 

Whereabouts Schmidty are you located...