6.4 oil temp problems - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 07-05-2013, 03:39 PM Thread Starter
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6.4 oil temp problems

I have an 08 6.4 with 105,000 miles and the other day after 45 min of combined city and highway driving my EOT hit 230 while the ECT still 190. I had no load the outside temp was mid 80s and i had the ac going. I took the truck to ford thinking the oil cooler had gone bad. They called me a couple days later saying 230 is ok for EOT and hot is considered 260. From what I have found the EOT and ECT should be within 4 degrees of each other. Obviously there is a problem but I am at a loss what to do. Any help would be greatly appreciated!
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post #2 of 10 Old 07-05-2013, 03:46 PM
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How are you monitoring your temps? what mods do you have on the truck? Def. sounds like a plugged oil cooler with those kind of deltas. I had a plugged up oil cooler and pulling my fifth wheel (10k pounds) I was seeing those kind of deltas.


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post #3 of 10 Old 07-05-2013, 05:49 PM
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Sounds like the diesel guy at that dealer is dumber than a box of ****.

Took them two days to diag it?

15-25 degrees MAX delta. And 25 is the high end, with high ambient temperatures, and load.

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post #4 of 10 Old 07-05-2013, 05:51 PM Thread Starter
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The truck has a 5 inch straight pipe with cat and Dpf delete. An s and b intake and a spartan 250 tune. I was using the dash daq to monitor EOT and ECT.
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post #5 of 10 Old 07-06-2013, 02:04 AM
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It sounds like the oil cooler. I had the same thing happen to my rig. I ended up installing the bulletproof diesel 6.4l half kit on and it works great. I heard to many horror stories of people replacing their oil coolers more than one time with their trucks.
Bullet Proof Oil Cooler System, 2008-2010 F-Series, 6.4L Half-Kit
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post #6 of 10 Old 07-07-2013, 12:12 PM Thread Starter
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Thanks for the help! I am gonna try the half kit and hope that works.
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post #7 of 10 Old 07-09-2013, 04:07 PM Thread Starter
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So I picked up the truck from ford after they charged me $150 to do nothing and they gave me a copy of an e mail they received from ford hotline assistance about oil temps.

"If there was a concern with high EOT the PCM should set a P012F DTC. The difference between the EOT and the ECT will vary depending on the ECT, air temp and engine load. The difference of 15 degrees is not valid for the 6.4, the 15 degree difference between the EOT and ECT was used on the 6.0 engine. Since there is no P012F DTC present it is not supected that there is a concern present. Once the EOT reached 259*F the PCM will derate engine power without setting a DTC, and it is normal for the EOT to be higher than the ECT because the coolant cools the oil."

Any thought on this...?
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post #8 of 10 Old 07-16-2013, 02:01 AM
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Did you install the half kit yet?
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post #9 of 10 Old 07-19-2013, 11:29 AM
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230 okay? Maybe pulling a double wide through CO.

15 degree is valid, and any EOT over 225 is not good.

Have you tried tuning down for awhile (spartan 250 tune)?

Any reason why you need to keep it tuned so high?

I agree the 1/2 kit will solve the heating unless you have a plug.

I hit 221 in 104 degree weather in Texas last week while in reGen mode, but I was going 85 with 1K of weight in the bed. LOL, I was running for the border. (J/k)

Threw the old P2002. I was so happy..
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post #10 of 10 Old 11-17-2016, 06:17 PM
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I also have a 2008 6.4 and started having a high oil temp problem during normal highway driving. It just slowly kept going up until it hit 260 degrees then the engine went into a low power mode. This happened from my house to about 18 miles down the road at 70-75 mph.

Based on everything I was reading on the forums, I finally broke down and spent big bucks to have the oil cooler replaced. This kept the EOT at about 242 and seemed to fix the problem for a while, at least it kept the engine from going into low power mode, but about a month later the same problem started up all over again. I have heard of people replacing the oil cooler several times to fix this issue, but this seemed stupid and for sure I was not going to do that.

Here is what finally worked for me, and I wish I had done this before replacing the oil cooler the first time:
I disconnected the radiator hose joint directly behind the radiator at the bottom and let all the coolant drain out. Next I put a water hose in the de-gas container and ran fresh water through. Next I reconnected the hose temporarily and filled the radiator all the way up and disconnected the hose again letting it all drain back out. I repeated this 5-6 times. Next I reconnected the radiator hose and put 2 containers of Prestone Radiator Flush+Cleaner in the de-gas container and filled everything back up to the fill mark with regular tap water and put the de-gas container cap back on. I drove it like this for the next 3 days with a monitor hooked up so I could watch the temperature.

After only 1 day, the EOT suddenly started dropping all at once down to 210 degrees which was within 11 degrees of the engine coolant temp. Obviously there was an obstruction somewhere in the coolant system that was adversely affecting the oil cooler but not the engine coolant temperature. To make sure the engine was cleaned out good, I drove it with this mixture in the radiator for 3 full days and now the EOT stays within 5-6 degrees of the coolant temp even at highway speeds of 75mph. Problem finally solved!!!

At the end of the 3rd day, I drained this mixture out and refilled the radiator with the recommended coolant for this engine and everything has been perfect ever since! I hope this post helps save a lot of people a lot of worries and money.
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