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post #1 of 12 Old 06-24-2014, 03:58 PM Thread Starter
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Oil Temp How hot is too hot?

I imagine this has been asked a thousand times but here goes. In my 2008 F250 6.4 my oil normally runs about 197-200, a few degrees from my coolant. Today, 80 degrees outside, running about 70-75 mph. My oil temp went up to 203, I eased off and it came down to 201, then down to 199 when I got off the highway, my coolant never got over 197 is this about normal? It's been about a thousand miles since my oil change. I've only had this truck a little over a month and I'm still getting to know it (I already love it)
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post #2 of 12 Old 06-24-2014, 05:16 PM
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I think 10 degree difference ect to eot is supposed to be max before you have a problem. My temps used to run the same. Since i switched to CAT coolant i dont think iv been over 200* and always about 4-5* difference.

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post #3 of 12 Old 06-25-2014, 03:15 PM
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I think 10 degree difference ect to eot is supposed to be max before you have a problem. My temps used to run the same. Since i switched to CAT coolant i dont think iv been over 200* and always about 4-5* difference.
Unloaded, yes 10 degrees or higher delta between the oil and coolant could mean that you are starting to have oil cooler issues. I don't think ford starts looking into it any further unless the temps are 15 or higher though. Towing on the other hand will make your deltas a bit further apart. It all depends on the terrain and the outside temperature. I've seen as high as 12 degrees towing but it comes back down fairly quickly once the load on the motor is lightened.

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post #4 of 12 Old 06-28-2014, 07:02 AM
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When it's hot out (which down here is most of the time) I'm running around 6-8F delta (201/203 EOT - 195 ECT) unloaded. When I'm towing it's around 10-12F delta (209/211 EOT - 199 ECT). Bumper towing about 7500lbs in 90+ degree weather.

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Last edited by RUFFSTUFF; 07-13-2014 at 06:16 AM.
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post #5 of 12 Old 07-14-2014, 12:33 PM
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My oil cooler is new and on a long mountian pass towing I had my EOT hit 240 while my ECT was only 215. I pulled over and let it cool down. Normal driving it is usually within 5* though.

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post #6 of 12 Old 07-26-2014, 11:14 AM
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Today's data. Outside temp 85F, sustained 75mph (30 min), trans temp stabilized at 180F, coolant temp 197F, oil temp 203F. EGT's around 620 @ 10lbs boost.

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post #7 of 12 Old 07-26-2014, 03:45 PM
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I'd say you have a problem....eot 240 and coolant 215.....if you didn't have a problem your coolant would likely be about 235....something not right.

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post #8 of 12 Old 07-26-2014, 05:21 PM
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I like to keep the oil temperature around 200* Once it starts getting around 220* it starts getting hard for the water temperature to stay at it's normal range. Oil temperature goes up water temperature usually goes up!!!

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post #9 of 12 Old 07-26-2014, 06:49 PM
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I think it's normal for the oil temp to climb faster than the coolant while towing 20,000lbs up a mountian pass. If I would have kept going I think the coolant would have caught up. I may not remember the spread exactly correct either. But I do know the oil was that hot.

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Try spinning a turbo with compressed air and hit it with diesel clean as you inhale at the turbo outlet, I call it a turbo bong.........that's some good stuff, makes you come up with all kinds of crazy ideas.


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Last edited by CowboyCody; 07-26-2014 at 06:53 PM.
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post #10 of 12 Old 08-21-2014, 12:10 PM
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I'm a new 2008 f250 6.4 owner also at 1 month. No tuner yet and no deletes but green wrench came on while pulling 10k so I took it to shop. Never lost power. He said eot got 16 or more degrees different from coolant. Said it might be EGR cooler (which I'm deleting ) or an oil cooler. I'm pissed as I've only had truck 700 miles. And no extended warranty. Does anyone have a roundabout price for oil cooler replacement? And what are the chances of it being the EGR cooler and NOT the oil cooler?
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