Oil Temp Warning
 

Ok, so my 2016 F350 6.7 is my first diesel. While going over mountains in Colorado my oil temp was in the 240 range. I came to a construction stop and without thinking I turned the engine off without idling to get the temp lower. When I was given the ok to continue and started the engine the oil temp gauge was buried and the red engine oil warning light came on. It quickly came off after about 20 seconds of running. My question is, did I damage the oil in any manner i.e. did it boil the oil, should I replace the oil, (currently about 2000 miles since last oil change) Any help appreciated.

I would say don't make a habit of doing that and you will be fine.

I also let mine cool down before shutting it off. I do a lot of traveling with my 5th wheel and never shut it off when fueling. It's funny how much thinking you have to do when owning a diesel. You have to wait till the glow plug light goes off before starting the engine. Then wait till it cools down to normal operating temp before shutting it off. I only use synthetic oil because it works better under extreme conditions better than the blend. The blend doesn't mean a 50/50 ether. Not sure how much synthetic oil that they can use to call it a blend. Doesn't say on the can.

Turbo's are the issue here. hot oil means no lube on the bearings.

Most of the oils that are suitable for our trucks have a 400° or higher boil point.
So 240° is with in reason during hard work.

I assume your oil continued to heat up after you shut down, But I doubt it climbed more than 20-30° I think I read that you will see that message over 250° But I can't remember where, So take that with a grain of salt
But 242-244 is pretty common on hard pulls

Your old post backs you up! I still cannot locate a document from Ford that discusses an acceptable range.

The truck de-rates somewhere in the 240's doesn't it? Or is that what happens at 250°F (which is getting too hot in my opinion)?

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



https://cimg5.ibsrv.net/gimg/www.for...401dd9a32c.png

I have hit as high as 248 with no derate in power. I do seem to recall 250 being the point at which it will limit power.

Oil temps on these trucks can easily hit the 240's range with no ill effects whatsoever. The oil is fine and the engine won't be harmed. These trucks are designed to run hot like that.

Same goes for the trans temp.

You have to wait for the glow plug light to go off? Whoops! :p

ajp207, was this going over Rabbit Ears Pass? I was there on Sunday going east. 30+ minute wait to get past it. Wait 2 minutes, move forward 200 yards, stop, wait 2 minutes, move forward 200 yards, etc, etc. The first stop I let the engine idle, the second stop I shut it down.

Like Senix said above, my engine oil temp often gets into the low 240's without any issues. A good synthetic oil won't have a problem going 30° F over that.

Not sure on the 6.7s but the 6.0s would derate or cut fuel, at 253 degrees. I felt it several times when towing with a questionable oil cooler on my old 6.0.

You really don't need to wait for the glow plug light. Only in the extreme cold (say +10F or below) would it really be a problem if you didn't. And while I agree that idling for a couple of minutes after a very hard pull is a good idea, you probably don't need to. Ford specifically tests their engines for survivability of shutting down after an extreme run. Turbo cooling through coolant convection is much improved over the early days. As for oil, Ford diesel oil isn't even a blend unless you specifically request it. It's just standard 10w30 diesel oil.

Oil temp warning
 

I was going over million dollar highway Ouray to Durango, Thanks for all the help

Oil temp warning
 

So, this is new to me, at what temp do you think this would become and issue, Thanks in advance