[rover4]

I've read a bunch of posts on EOT vs. ECT deltas. But my question is, how hot is "HOT!!!"? If I were towing an 8,000 lb trailer in 90+ degree weather and saw my oil temp rising, at what point would I say, "Holy crap! Time to pull over and let this engine cool down."?

 

[worldwide73]

You're truck probably won't let it go that far, but hot would be 250-275+. That light of load shouldn't be a problem.

 

[chuckster57]

Since the max difference in temps you want to see is like 15 degrees, then if your monitoring both the ECT and the EOT, I would think that around 255 is the max. Do the 6.0's have a warning indicator like the IDI's that will activate when the coolant reaches 240?

 

[Fast Forbes]

My ECT got to about 231 and my info center on my dash told me to check gauges my temp gauge was almost to the red but never got there once the fan turned on.

 

[rover4]

Thanks guys. I watched my EOT climb to 230 while towing my trailer on a slight grade when it was 100 degrees out. At one point I looked down and my ECT was 205. That's a 25 degree delta and the delta got smaller when the freeway leveled out. Without the trailer, my delta was about 18 degrees (213-195). Last weekend I did the whole back flush, Restore flush, Restore Plus flush, 24-gallon-distilled water flush routine. What a pain! Now my delta is about 20-22 degrees (215-193). Grrrrr!!!! We've got RV reservations in Morro Bay next week. And 10 months left on my extended warranty. As long as I can make it there and back while watching my temps, I'll see if I can get my local Ford dealer to replace the oil cooler under warranty.

 

[REO-Diesel]

Towing a 4,000 lb trailer I watched my ect stay at 220 and my eot got to 265. When towing my eot is always 15-20 degrees higher then ect. I'm assuming there is a block in one of my lines and instead of going to the oil cooler it's bypassing it.

 

[rover4]

Towing a 4,000 lb trailer I watched my ect stay at 220 and my eot got to 265. When towing my eot is always 15-20 degrees higher then ect. I'm assuming there is a block in one of my lines and instead of going to the oil cooler it's bypassing it.

I think you may have a typo in there somewhere. What I read is you have a 45 degree delta when towing and a clogged oil cooler.

 

[tstammer]

I have asked my dealer about this 15 degree temp diffrence and they looked at me like I had two heads. I have asked them to look at the cooler, they agreed and I was told everything was within specs. Im using the Edge Gauge monitoring set up keep in mind the stock gauges never go above the mid point of the gauge.

Im constantly running close to the 15 degree diffrence, it does drop however it does go over. My truck runs fine and has never given me any indication that something might be ready to break down.

I'm curious as to where this temperature diffrence started, just looking for input since I do read the forum and have bought it to my dealers attention.

Tom

 

[REO-Diesel]

I think you may have a typo in there somewhere. What I read is you have a 45 degree delta when towing and a clogged oil cooler.

Correct. No typo.
This occurs when running a mild street tune.
Truck has 155 injectors.
Industrial injection turbo.
Egr blockoff.
4 in turbo back exhaust.

 

[teamroper60]

Correct. No typo.
This occurs when running a mild street tune.
Truck has 155 injectors.
Industrial injection turbo.
Egr blockoff.
4 in turbo back exhaust.

You have a bad oil cooler....

 

[teamroper60]

Thanks guys. I watched my EOT climb to 230 while towing my trailer on a slight grade when it was 100 degrees out. At one point I looked down and my ECT was 205. That's a 25 degree delta and the delta got smaller when the freeway leveled out. Without the trailer, my delta was about 18 degrees (213-195). Last weekend I did the whole back flush, Restore flush, Restore Plus flush, 24-gallon-distilled water flush routine. What a pain! Now my delta is about 20-22 degrees (215-193). Grrrrr!!!! We've got RV reservations in Morro Bay next week. And 10 months left on my extended warranty. As long as I can make it there and back while watching my temps, I'll see if I can get my local Ford dealer to replace the oil cooler under warranty.

That flush clogged up your oil cooler... You are gonna need a new one.. If it were me, I would get it fixed before I took off on a vacation like that. Breakdowns on the road are no fun at all..

I see a lot of posts where people will say something to the affect of, "On a grade, my delta is 20 degrees but once I hit level ground it falls back to within 15 degrees." Folks, the test for a bad oil cooler is to measure the delta under a load (such as towing up a grade or WOT acceleration). It is not supposed to be measured cruising at 70mph on flat ground. If your delta is exceeding 15 degrees under a load, you have a bad oil cooler.

 

[teamroper60]

I have asked my dealer about this 15 degree temp diffrence and they looked at me like I had two heads. I have asked them to look at the cooler, they agreed and I was told everything was within specs. Im using the Edge Gauge monitoring set up keep in mind the stock gauges never go above the mid point of the gauge.

Im constantly running close to the 15 degree diffrence, it does drop however it does go over. My truck runs fine and has never given me any indication that something might be ready to break down.

I'm curious as to where this temperature diffrence started, just looking for input since I do read the forum and have bought it to my dealers attention.

Tom

The info on the 15 degree delta is from Ford and is at least 2 and a half years old.. If your dealer is not aware of it by now, I would be considering a change in dealerships..

 

[HeavyAssault]

The PCM will defuel the motor when EOT is over 253*F. Take in mind there are other parameters that are being checked before the defuel happens. What are all the parameters? I just don't know exactly.

For EOT temps in general I have discussed this with other "oil smart" people. I have been told the 250* range is good for conventional oils, and 350*+ can be used for synthetic oils. Since the PCM defuels at 253* I'd say thier info is correct.

What does all this mean? Well if you want to protect the oil from overheating maybe running a quality synthetic is a damn good idea.

If you are running an EGR delete of any type the Ford 15* delta doesn't apply to you.

TeamRoper covered the rest!! +1 with his posts.

 

[REO-Diesel]

The PCM will defuel the motor when EOT is over 253*F. Take in mind there are other parameters that are being checked before the defuel happens. What are all the parameters? I just don't know exactly.

For EOT temps in general I have discussed this with other "oil smart" people. I have been told the 250* range is good for conventional oils, and 350*+ can be used for synthetic oils. Since the PCM defuels at 253* I'd say thier info is correct.

What does all this mean? Well if you want to protect the oil from overheating maybe running a quality synthetic is a damn good idea.

If you are running an EGR delete of any type the Ford 15* delta doesn't apply to you.

TeamRoper covered the rest!! +1 with his posts.

Well I was exceeding 265 towing about 6000 lbs doing 60 on the highway, flat surface. Never defueled itself but also could be cause the SCT reprogrammed the PCM.
And yes I have the egr blocked off completely. But it doesn't make sense that it could handle 350 when the motor isn't supposed to exceed 240 ish on the ECT's. Keep in mind this was a 108 degree day.

 

[HeavyAssault]

The rating of the oil has nothing to do with the PCM limits. I was giving that out as the oil can handle the heat long after the PCM limit is reached.

It's EOT 253* not ECT.

The PCM should recognize the ECT, EOT, pedal position, BOOST, OAT, etc etc. ALL these will determine if it will defuel when EOT hits 253*. Since you were in gear, under load the PCM will not defuel.

Say you were at idle, in park and EOT goes to 253*...I bet it will defuel. I don't know all the other factors the PCM uses before it will defuel when EOT hits 253*.

 

[HeavyAssault]

Correct. No typo.
This occurs when running a mild street tune.
Truck has 155 injectors.
Industrial injection turbo.
Egr blockoff.
4 in turbo back exhaust.

What type of EGR block off are you using??

 

[teamroper60]

And yes I have the egr blocked off completely.

Is it blocked off or deleted? Typically, a blocked off EGR system leaves the EGR cooler in place and blocks the flow of exhaust gases into it. That type of system can still go bad because coolant is still flowing through it..

 

[REO-Diesel]

I got a bulletproof egr but decided to get a block off kit from Dfuser. Ford installed it all.

 

[Gumby86]

If your oil temps get 300+ I would be worried about all the plastic pieces in your engine starting to melt.

 

[HeavyAssault]

In the end the 15* delta doesn't apply to REO-diesel since the EGR is deleted/bypassed. I would make plans to swap out the oil cooler and get some ELC. For the EOT you are seeing you may want to change to some synthetic motor oil for extra protection until you get the oil cooler replaced.