I cant find my other thread, 2005 F250 6.0 94K on the clock, yesterday 85* temp driving for about 30 min 70mph that my oil temp crept up to 234* I searched and didnt find normal temp ? is this high with no load ?

TIA

 

Yes it is high. Looks like your oil cooler is clogged on the coolant side. You can try back flushing it (instructions in Tech Section at top of this forum), but probably will need to replace...

 

Check ECT first. If your ECT is 225F that isn't a bad oil temp. The oil cooler being plugged is about the differential between the ECT & EOT.

ECT of 220 not towing means you've got some cooling system issues.

 

Sorry forgot to post ECT is 190 at the time EOT was 235

 

ttt.........this is a pretty wide spread, no wrench thrown up on the dash

 

It's possible that your truck doesn't have the flash for that. IIRC it was added later.

 

When the truck goes into over temp ? or thinks it is over heating, it will engage the clutch fan, throw the wrench and peg the needle, but ECT never goes above 190*

 

Unloaded on my 6.0 studded/deleted ect with innovative diesels second highest tune the highest I've ever seen is 218 ECT and 214 EOT hauling *** up a steep grade for 35 minutes (Okanagan Connector in BC, Canada).

And that's at 20-25 lbs of boost and 120 km/hr all the way up passing everyone

The highway going up is a 6.5% grade for 35 kilometres which is a pretty good hill to climb

Just to give you an idea!

 

Looks like an oil cooler is in your future. You can try backflushing which has had mixed results. Look at the tech folder at the top of the forums. If you do replace the oil cooler, make sure to flush the system really good first so you don't plug up the new one.

I wouldn't' run it much longer in this conditions. 235 is getting pretty hot. Engine defuels at 253EOT, but most here recommend keeping it below 220F, especially for extended periods. Under heavy load the oil will gain 50F+ across the engine, so 235 you are seeing at the cooler would be sending 285F oil back into the sump.

I would definitely avoid running the engine hard (towing) until you get this fixed. That will elevate the ECT & EOT and you could quickly hit defuel point.

Are you running synthetic or dino oil? Synthetic will definitely hold up better under the elevated temps, but I would still be worried.

 

thanks for the reply, running Rotella T blend I think, I have another truck to drive, a 2010 F150 with 245K on the clock LOL and it doesnt burn any oil between changes,

 

so whats an average cost to put in a new oil cooler ?? Why in the He!! did ford put the thing in the hottest part of the engine, and they use hot coolant to try to cool the oil

 

They don't use hot coolant to cool the oil.

 

antifreeze coolant is circulated through the oil cooler right, if its 190* its hot, or did I miss something

 

Well, you have me there! The point was that 190 degree coolant is the coldest temperature of the circulated fluid (once the engine is up to operating temperature anyway).

It is plenty cool enough to keep the oil where it needs to be as long as the oil cooler doesn't plug up. It shouldn't plug up if the coolant system is kept clean and you use EC-1 rated ELC coolant.

Now the EGR cooler uses hot coolant (out of the oil cooler), That hasn't been the best design, but still it works reasonably well if the right coolant is used.

 

Do yourself a favor and do a backflush first. Some CLR, Simple green and a couple of fill and drains of tap water to see where your deltas are after it's done could save you vs having to replace the oil cooler...

My deltas a week ago were around 28°. I backflushed through the top of the motor into the oil cooler with the adapter, with the lower hose off the radiator. Ran water into the system for around 10 minutes, I also have a airline hooked up so I can purge it every so often to loosen up the crap in the oil cooler. Shut off water, purge out the water with air, dump about 1 quart of CLR into the oil cooler, let sit for 20 minutes, flushed and repeated the process, flushed again, removed adapter from top of engine, put original "cap" back onto the oil cooler filled up system with a quart of Simplegreen, and filled with tap water with the lower hose on. Ran system up to temp with a 20 minute drive. Drained the system, and flushed tap water through the degas bottle, filled with acid and water and bring back to temp, flush again through degas, filled water into the system 3 times... now see where your deltas are, should be around 8° or less after 1/2 hour drive. If above you have to replace the oil cooler. If below flush with distilled water 4 times(around 14 gallons total for all 4 flushes), then see how temps are again. If all holds true refill with ELC pink coolant that is the concentrate not the 50/50 mix.(get 4 gallons and you will use about 3.5 gallons, then take the extra 1/2 gallon and mix with water for a backup if/when you need it.