Rotella oil help - Diesel Forum - TheDieselStop.com
6.7L Upgrades and Aftermarket - Engine Upgrading or adding OEM or aftermarket equipment to your 2011-Up Super Duty truck with 6.7L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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post #1 of 17 (permalink) Old 02-23-2017, 01:57 AM Thread Starter
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Rotella oil help

Manual says 10w30... I live in Alaska so it gets cold and stays cold. Will that oil hold up in the cold or am I better off just running a 5w40 full syn.
Also from what I understand 10w30 is a synthetic "blend"...

Last edited by Skylor; 02-23-2017 at 03:11 AM.
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post #2 of 17 (permalink) Old 02-23-2017, 04:46 AM
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I would run 0w30/0w40 or 5w40 per manual for your extreme temperatures.

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post #3 of 17 (permalink) Old 02-23-2017, 07:52 AM
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It would be advantageous to run a full synthetic 5W-40 such as Rotella T6.

For that matter, switching all of your fluids to 100% synthetic would be a wise practice.

Especially if you are making trips north.

Finally a great snowmachine season, eh?

EDIT: Rotella does have a 0W-40 Full Synthetic Diesel rated oil but I have only seen it Canada and its not cheap.


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post #4 of 17 (permalink) Old 02-23-2017, 09:52 AM
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If you are regularly seeing temperatures to the left of the red line (taken from the diesel supplement) I would run a xW-40 or xW-30 and call it good. You are correct that most 10W-30 oils are synthetic blends.




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post #5 of 17 (permalink) Old 02-23-2017, 02:47 PM Thread Starter
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Thanks for the info guys. Ya I'm leaning towards doing a 5w40 for all year long to make it easy on myself. I suppose I could run a 10w30 for summer use but I've always been on the wagon of using a full synthetic.
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post #6 of 17 (permalink) Old 02-24-2017, 01:50 AM
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I'm living in Fairbanks, we saw -50 here a time or two this winter. I'm running full synthetic 5W-40. No issues with starting in my 2012.


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post #7 of 17 (permalink) Old 03-09-2017, 07:09 AM
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yes 0w40 or 5w40 will work well for you....and u can leave it in for the summer too, no worries there.

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post #8 of 17 (permalink) Old 04-20-2017, 09:21 AM
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I've run this lots too. Not sure if it's available in Alaska though.

Mobil Delvac 1 ESP 0W-40
Mobil Delvac 1?*ESP 0W-40 | Heavy Duty Engine Oils | Mobil? Canada

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post #9 of 17 (permalink) Old 04-21-2017, 06:16 AM
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I've run this lots too. Not sure if it's available in Alaska though.

Mobil Delvac 1 ESP 0W-40
Mobil Delvac 1?*ESP 0W-40 | Heavy Duty Engine Oils | Mobil? Canada
I see the 0W-40 weights in Canada regularly but its seldom an on the shelf item in the Great Land.


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post #10 of 17 (permalink) Old 04-24-2017, 08:58 AM
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There is another thread extensively talking about the oils in the regular 6.7 section.. seems Ford has changed their minds on the specifications for the recommended oils,,

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post #11 of 17 (permalink) Old 05-13-2017, 08:07 AM
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Originally Posted by Skylor View Post
Thanks for the info guys. Ya I'm leaning towards doing a 5w40 for all year long to make it easy on myself. I suppose I could run a 10w30 for summer use but I've always been on the wagon of using a full synthetic.
Yup. 5-w-40 year round is what I do. 'So easy.

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post #12 of 17 (permalink) Old 05-14-2017, 05:14 AM
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Mobile Delvac 1 is the real synthetic that's why the poor Point. It's much better than Rotella T6 48 to 50 below zero!!!
- 42 Celsius equals -43.6 Fahrenheit for Rotella T6 5-40
- 45 Celsius equals -49 Fahrenheit four Mobile one Delvac 1 5-40

Last edited by 1914fatboy; 05-15-2017 at 06:07 PM.
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post #13 of 17 (permalink) Old 05-14-2017, 06:18 AM
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Mobil Delvac-1 is an outstanding Diesel Motor Oil but that does not mean Shell Rotella T6 is not an excellent oil as well (atleast the CJ-4) and, surprisingly, Pour Point is not the most important consideration in extreme cold weather operations

Pour Point:

Shell Rotella T-6 5W/40: -42*C

Mobil Delvac-1 5W-40: -45*C


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post #14 of 17 (permalink) Old 05-16-2017, 04:16 PM
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So just for discussion sake, what is the most important cold weather consideration for motor oil?


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post #15 of 17 (permalink) Old 05-21-2017, 01:32 AM
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I read an article that mentioned you should not start an engine at no less than 20 above the poor point so I consider that in Minnesota when I look at purchasing oil it can get to 30 below zero in southern Minnesota or if you're at a motel in Duluth. I currently use Mobil Delvac one 5-40 because it has the poor Point 49 below zero Fahrenheit so technically I can start it at 29 below zero not that I'm going to do that if I can help it ,I also can get my fuel down to about 37 below zero , I also like the oils that will deliver in the summer months trucks are running at 80,000 miles without any problems ,I change at 5,000 miles , I would like to run Mobil Delvac 1 LE 5-30 it has a Poor point of 59.8 below zero Fahrenheit and would be an excellent summer oil semi's running it 80,000 I will have to settle for the 5-40 at $27 a gallon 5-30s hard to find I would think the zero30s and zero40s would get you way down into the basement Poor point, I only put on five or 6000 a year so if I had to I would get Amsoil 5-30 3,000 if I had to, and run it all year The price wouldn't affect me at one oil change , whatever you can fine in your area could be a whole different ballgame hope this helps a little !!!
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