Towed I 40 westbound to Santa fe today. Air temp was 86 to 92 and on several occasions my Oil Temp on the Edge alerted. I have it set at 135 degrees. Highest reading I saw was 141 degrees (I think). No apparent ill effects or codes. Each time the Engine coolant was also elevated to the 120 degree range. I don't recall either the 6.4L or the 7.3L oil getting that hot. So, is anybody else tracking it and having similar or different readings.

 

I have read on here of much higher oil temps.
I know for a fact that a properly functioning Hydraulic system will run at Ambient plus,
100 Deg. F
Not that we are talking a Hyd. system but similar.

 

If I began to exceed 245°F EOT on my truck I would start taking it easy. I haven't seen any official numbers from Ford but what I do know is the truck will self de-rate if you are pushing it too hard to protect itself. 250°F would seem a bit high for my comfort zone but I don't know the value that causes the de-rate.

I'm guessing you mean your highest temp was 241? 195 (ish) is normal operating temp for the oil.

 

Here's an old post from PH.


https://www.ford-trucks.com/forums/1...l#post11737463

 

I really trust PH's posts and opinions. He really gives these trucks a workout pulling horses and trailer up and down the mountains. His 2011 had well over 100k miles on it before he went out and bought a 2015...

 

I have hit 238 a lot of times on the oil temp. It really didn't concern me.


My oil analysis came back and confirmed that the oil was still good as well.

 

In my opinion which has over 300,000 miles under 6.7 power towing, go ahead and try to get the oil to 250°, I bet you can't......

Seriously, you well know these missions compliant diesels are hot engines and actually thrive on heat to run efficiently. Cool fuel and air, hot exhaust and oil, high operating temp, and a big cooling system to keep the heat in specific range but also to retain heat for consistent parameters. 400HP makes an awful lot of btu.....

 

you meant 200 hundred plus degrees, right? 120 is just barely warm here in Texas!...

 

I'm with Joel on this one. I have seen 240-245 just about every time I have been on a long pull with the 16,000 lb toyhauler and although the temps climb pretty quickly, it seems to stabilize just about 240 not get any worse. The high oil temps caused by this motor are a pretty good excuse to use a good synthetic oil.

 

Mobil1 5-40
flash point is 420°
thermal break down starts @ 270°

SHELL ROTELLA T, 15W40
flash point 400
thermal break down starts at 250°

In any normal heavy extreme use on this planet, you will never see high enough temps to be concerned with oil temps on the 6.7

The cooling systems on our 6.7 is the stoutest I've ever seen on any vehicle. I'll rephrase that, the 2 cooling systems on our 6.7 are the stoutest I've ever seen.
It truly is overkill imo.

1 day in August some years ago, had a 2011 xlt in Phx on a 117° day. Drove to the desert, a 3 hour ride to Glamis, towing 15,000lbs, it was 114° when we got there in Glamis. (108° at 1:00 am that nite)
Left the 6.7engine running in the sun for 3-4 hours with jumper cables connected from it to my sand car, to charge its dead battery.
We took a siesta in the ac'd Toy Hauler while the battery charged up. The heat was the hottest I've ever experienced. Think i lost brain cells from that dry heat... lol.
The truck never missed a beat or overheated. Never went over normal range on the gauges.

jmo

 

I wonder, if the 6.7 design engineers had their way, I'd bet they want the engine to run hotter than they have it now. For max performance I'd like to know where the high end of the limit is and how much they had to back it down for longevity, reliability, etc....

Of course, I'm likely to be wayyyy wrong too.

 

I regularly see oil temps at 245 F, basically every loaded uphill pull in the summer. Temp go back down when coasting downhill so oil is not at that temp for more than a few minutes at a time.
Given that these trucks use engine coolant to cool the oil, The oil should be regulated until the coolant circuit has failed for whatever reason (fan failure, leak).

 

Actually it is not. Not when you can get the temp guage to 3/4 pretty darn easy. Radiator should be just a bit larger.

 

As mentioned, I see 242° on just about every tow that has any kind of grade during the summer months. It cools off as soon as you top the grade.

And like Ruschejj, I doubt you can get it to hit 250°.

 

Yes I did Sam, getting along in years and making more mistakes. I even left home and forgot to load any fire arms. Loaded the bag with all the ammo and ear and eye covers but forgot to load even one gun. I was well into bama before I realized it. So, I'm the proud owner of a Glock I bought off the internet in Oklahoma City. I think by next Easter I'll be able to hide my own eggs.