What is a normal oil temperature in frigid temps? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 01-23-2014, 04:58 PM Thread Starter
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What is a normal oil temperature in frigid temps?

I live Indiana where the heat wave continues at 5 degrees and windchill at -20 degrees. I noticed my oil and water temps barely get to 170 degrees while driving for an hour. I get mixed answers from service techs at multiple shop when they say, "bring it in and we can check it over $110.00 an hour. I running Rotella T6 5w40 with a coolant flush about 3,000 miles ago. My Scangauge tells me all vitals are good, but it can't hurt to ask.
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post #2 of 14 Old 01-23-2014, 05:07 PM
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Just replace your thermostat and run some cardboard in front of your radiator. Your thermostat seems to be stuck open but then again it's cold as heck. $30 and 30 min is all it takes to replace it. I would try the cardboard first though and see what happens.
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post #3 of 14 Old 01-23-2014, 05:14 PM
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It has been the same kind of cold in CT.
My truck has been running about 5-10* lest then normal also.
ECT about 175-180* and EOT 170-180*

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post #4 of 14 Old 01-23-2014, 05:26 PM
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Are you guys running stock oil coolers? As my ect are around the same as what you are seeing ,but my eot is 150-160 on the high side in low teens / single digit temps. I'm going to do the cardboard trick next time it gets cold around here. right now in the 40's I see 180-190 on both

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post #5 of 14 Old 01-23-2014, 05:31 PM
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Ovah here in NH at a balmy 2* right now I'm running my 5w40 at 190* but my coolant won't get over 180*-182* stock egr/stock oil cooler. I think I may have some sort of issues myself. Off the highway my oil drops between 185*-190*

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post #6 of 14 Old 01-23-2014, 05:42 PM
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Wired, in the 40 degree outside temps, both should be 190 or higher.

Guys, it's around 8* here! my wife's truck is running in the low-mid 180's. It's just where it's cold and the barn door radiators these trucks have are doing their jobs. You can do the cardboard if you like, but 180* isn't going to hurt anything.

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post #7 of 14 Old 01-23-2014, 06:35 PM
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It was -30 here yesterday and my eot was 184 and ewt was 177 and that was with cardboard in the front.

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post #8 of 14 Old 01-23-2014, 06:48 PM
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At 5 degrees this morning my EOT settled in at 198 and would go up to about 201.
My ECT was running 188 to 192.

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post #9 of 14 Old 01-23-2014, 07:58 PM Thread Starter
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Tell me about it. This is the worst winter I have seen in 5 years in Indiana. This polar vortex is kicking our a$$. I kind of figured I was worried over nothing since mother nature has put her thumb on us, but getting the same answers help. Although, I never thought about the t-stat, so I am going to replace it since I don't know really how old it is. So much for not buying a snow plow... my neighbor has banked over $12,000 in contracts in the last 30 days. How in the world are you guys running at 20 degrees higher?
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post #10 of 14 Old 01-24-2014, 08:09 AM
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I have not run any cardboard and here in Fargo ND, its been cold as hell all winter. at the interstate speeds (75-85mph) and temps down to -27f I've been able to keep it above 180f (ECT) I did replace the thermostat with a motocraft unit. But I'd love to get that ECT up in the mid to high 190f range.

This graph is from 12/23 when the cold temps ranged from -25.5f to as warm as 3.2f during a single trip. I don't thing it actually was 3.2f, that must have been a false reading from when I was sitting and idling or something similar. I included GPS speed for reference.


I think for next year, I'm going to buy a spare XL grill and get a zip up cold front.
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