Whats an Acceptable Engine Oil Temperature (EOT) - Ford Powerstroke Diesel Forum
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Old 04-05-2012, 04:58 AM
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Whats an Acceptable Engine Oil Temperature (EOT)

I did the head gaskets on my truck back in Dec of 2011. I didn't replace the oil cooler at that time. The truck has runs good since I did the head gaskets. Back in Jan, I got a scan guage for this truck. I did a trip to NY with this truck and noticed the EOT was running about 225-230 degrees. So last month I picked up a new oil cooler on craigslist on the way back from NY. I did a coolant system flush last month before changing the oil cooler. Around Feb 15th I changed out the oil cooler. After I changed out the oil cooler I noticed the EOT were ranging from 193-196. Last week I made a trip to Lubbuck and somewhere around Breckenridge the wrench light came on and showed Oil cooler efficiency monitor - DTC P012F code. The EOT was at 203 degrees and the ECT was showing 192 degrees. Never before has this wrench light come on. I noticed it was a little low on coolant, but couldn't find any leaks. I was running the truck about 75 MPH. I topped off the coolant and the coolant level hasn't changed since I topped it off. Normally running the truck around town I getting 196 degrees on the EOT and the ECT ranges from 183-192 depending on how I'm driving the truck. The truck has a new thermostat also. Are these Engine Oil Temperatures acceptable? I guess the answer to this question varies alot depending on who you talk too.
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Old 04-05-2012, 05:27 AM
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11*F isn't a terrible delta, but could be lower. You running a coolant filter?
Not sure why the light came on.

BTW, I can tell you're from Texas. Where at?
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Old 04-05-2012, 06:05 AM
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Those numbers sound fine to me. I usually run 190-195 ECT 195-205 EOT around town.

If you're using AC, your ECT (and EOT) will actually be cooler than if you're not (might explain NY/Texas disparity) as the AC causes your fan to run 100% of the time, whereas without AC, it only turns on and off as needed.
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