What weight oil to use in winter - sub zero temps. - Diesel Forum - TheDieselStop.com
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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. 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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Old 10-29-2011, 12:41 PM   #1 (permalink)
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What weight oil to use in winter - sub zero temps.

I need to change my oil this weekend. This is my second oil change. First one was done by Ford. I don't know what weight oil they put in. I went to Walmart to get 5W40 as the book states. I only found synthetic. I'd like to stick with non-synthetic if that is currently what is in there (and I'm pretty sure it is).

I live in Minnesota - the winters can get harsh. Do I need to stick with 5W40? I can look elsewhere. Or....break down and pay Ford to change the oil. I have searched the forum for the answer to this -and got sick of all the oil weight threads turning into a huge controversy (and never really answering the question). So please, anyone in the uppermidwest, please tell me what you run for oil over the winter.
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Old 10-29-2011, 03:21 PM   #2 (permalink)
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I'll suggest using the 5w40 synthetic. There are no issues about changing from conventional to synthetic oil although some mythology persists. I'm running the Rotella T6 synthetic in my diesel PUs, it can really help with the cold weather starting. The synthetics are better in hot weather too!
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Old 10-29-2011, 03:42 PM   #3 (permalink)
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Agreed, no problem switching from Syn to non-syn and back again. I would be running syn 5-40 as well and keeping it plugged in at night.
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Old 10-29-2011, 07:08 PM   #4 (permalink)
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Anyone tried the 0-30? I see the manual also shows it as an alternative. I just did my first oil change and used the Mobile 1 synthetic in that weight with cold weather coming.
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Old 10-29-2011, 07:54 PM   #5 (permalink)
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Anyone tried the 0-30? I see the manual also shows it as an alternative. I just did my first oil change and used the Mobile 1 synthetic in that weight with cold weather coming.
Is that API CJ-4 rated oil? If not, you'll void your warranty, CJ-4 rated oil is required.

http://www.apicj-4.org/faqs.html
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Old 10-30-2011, 09:32 AM   #6 (permalink)
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Rotella T6 5W-40, Mobil 5W-40, Schaeffer's 5W40 are all good oils.


I am personally running Schaeffer's 5w40 year round, And I live in FL.
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Old 10-30-2011, 09:55 AM   #7 (permalink)
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I have used Rotella in my D-max's and will use it in my new Ford. All the name brand oils are fine. In cold weather 5w-40 or 0w-40 will be fine. I prefer 5w-40 year round.
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Old 10-30-2011, 01:31 PM   #8 (permalink)
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I agree with the above posters. Use a name brand oil, CJ-4 Rated, 5w - 40 (or 0w-40) and you will be fine. This information is recommended in the trucks user manual. I would also stick with Synthetic, regardless. You probably put down at least 50k for the truck, and IMHO you should be able to afford a quality oil change every 5k-7k miles. I would say go Syn and don't look back.

I used a free oil change coupon from the dealer and got the FoMoCo stock oil with it. BUT I don't live in an area that even gets to 32F. Funny thing, I checked what it would cost for Shell Rotella T-6 from the dealer and it was cheaper than the FoMoCo stuff.

I asked for the T-6, but because of the coupon, they wouldn't do it.
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Old 10-30-2011, 03:17 PM   #9 (permalink)
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Thank you everyone for your thoughts/ideas/opinions! I will get the synthetic 5W40. Anything I can do to make winter operation better I will jump at. Dreading those cold days......
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Old 10-30-2011, 04:59 PM   #10 (permalink)
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i use mobil 1 5-40 in my f-550 rollback wrecker year round
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Old 10-31-2011, 06:58 PM   #11 (permalink)
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5-40 is about as low as u want.

The way these engines fuel dilute from regens you'll have water in there after 10k if you use 0-30.
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Old 10-31-2011, 08:11 PM   #12 (permalink)
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Per your Diesel Supplement on page 44. For normal usage above zero degrees use 10W30. Any temperature below zero requires 5W40. For temps above 20 degrees could run dino 15W40. I would run synthetic 5W40 in the winter and 15W40 in the summer.
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Old 11-07-2011, 05:09 AM   #13 (permalink)
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Do you use fuel additives? if not use this only in cold temperature PM-23A motorcraft anti-gel and performance improver and in warmer temperture use PM-22-A motorcraft diesel cetane booster and performance. The PM-23-A is so diesel fuel will not gel in cold temperture. And PM-22-A will increase diesel cetane level. Both are design to add lubricity to engine,injectors,etc, Intended to add lubricity compensate for the lack of llubricity in today's ULSD fuel at the pumps. If you buy the product read the label theres more benefits.
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Old 11-07-2011, 07:07 AM   #14 (permalink)
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Quote:
Originally Posted by BlackBerryCurve View Post
Do you use fuel additives? if not use this only in cold temperature PM-23A motorcraft anti-gel and performance improver and in warmer temperture use PM-22-A motorcraft diesel cetane booster and performance. The PM-23-A is so diesel fuel will not gel in cold temperture. And PM-22-A will increase diesel cetane level. Both are design to add lubricity to engine,injectors,etc, Intended to add lubricity compensate for the lack of llubricity in today's ULSD fuel at the pumps. If you buy the product read the label theres more benefits.

I use PM-22-A here in the south. If I was farther north or west I would use the PM-23-A. I get about 1-1.5 mpg more using the PM-22-A in the summer. In the winter it makes little difference. Can't explain why other than maybe the winter fuel cause it possibly.
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