What Weight Oil in Cold Weather ? - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. 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 6.0L Power Stroke engine.

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Old 12-18-2007, 08:38 PM   #1 (permalink)
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What Weight Oil in Cold Weather ?

Hi everyone . I have Two 2005 F350 6.0Ls power stroke Paramedic Rigs that i maintain. Does any one use different weight oil during the Cold Winter Months ? Last winter i used 10w30 Motor craft super duty because of some starting complaints from the drivers. Which was recommended in the Owners Manual. It did help starting . Now i see that the new 6.4l power stroke Manual Shows that you can use 10W40 motor craft super duty oil For the entire Temperature Range . I Guess I'm just looking to see what other fleets and owners do with these Terrible 6.0Ls
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Old 12-18-2007, 09:47 PM   #2 (permalink)
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Re: What Weight Oil in Cold Weather ?

I find Shell Rotella 5-40 synthetic works best for cold starting. I am not familiar with the 6L.
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Old 12-18-2007, 10:06 PM   #3 (permalink)
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Re: What Weight Oil in Cold Weather ?

The 6.0 uses HEUI fuel system with a high pressure oil pump. It is the HPOP that is largely responsible for oil shearing in these engines. The 6.4 doesn't have an HPOP, it uses piezo injectors with a high pressure fuel pump. It also has a different bearing design in the low end. I would not assume that the oil specs for that engine automatically carry over to the 6.0. That said, a lot of people are claiming that 5W-40 works well in the 6.0L in winter and summer. Not sure what would happen if you had an oil related failure under warranty, though.
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Old 12-19-2007, 12:57 AM   #4 (permalink)
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Re: What Weight Oil in Cold Weather ?

I'm using Mobil 1 with great results with the starting and running of the engine.
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Old 12-19-2007, 06:42 AM   #5 (permalink)
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Re: What Weight Oil in Cold Weather ?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Winky</div><div class="ubbcode-body">Hi everyone . I have Two 2005 F350 6.0Ls power stroke Paramedic Rigs that i maintain. Does any one use different weight oil during the Cold Winter Months ? Last winter i used 10w30 Motor craft super duty because of some starting complaints from the drivers. Which was recommended in the Owners Manual. It did help starting . Now i see that the new 6.4l power stroke Manual Shows that you can use 10W40 motor craft super duty oil For the entire Temperature Range . I Guess I'm just looking to see what other fleets and owners do with these Terrible 6.0Ls </div></div>
I run 5W40 Rotella Syn year round and it works very well for me. We have had temps down to 0 degrees F and my truck starts and runs no problem; not plugged in either.
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Old 12-19-2007, 09:51 AM   #6 (permalink)
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Re: What Weight Oil in Cold Weather ?

Ditto here.
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Old 12-23-2007, 09:20 PM   #7 (permalink)
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Re: What Weight Oil in Cold Weather ?

Shell 5w-40 in winter and shell 15w-40 in summer. The engine will still run rough when cold, but it helped ours quite a bit.

Don't use Mobil 1, it is not designed for diesels and does not have the CI-4 rating. If you can find Mobil Delvac 1 then by all means as it is a diesel rated oil.
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Old 12-23-2007, 10:30 PM   #8 (permalink)
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Re: What Weight Oil in Cold Weather ?


How 'bout this...

http://www.mobil1.com/USA-English/Mo...uck_5W-40.aspx
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Old 12-23-2007, 11:13 PM   #9 (permalink)
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Re: What Weight Oil in Cold Weather ?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: snoboy</div><div class="ubbcode-body">
How 'bout this...

http://www.mobil1.com/USA-English/Mo...uck_5W-40.aspx </div></div>

Very interesting, the data sheet looks like rebottled Delvac 1. I wonder how the price compares to the Gallon Delvac 1?

Mobil claims it is the same product after all.
http://www.mobiloil.com/USA-English/...rboDiesel.aspx
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Old 12-23-2007, 11:14 PM   #10 (permalink)
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Re: What Weight Oil in Cold Weather ?

That stuff costs a bloody fortune I think it is 7 bucks a quart x15... I don't know anyone that rich...
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Old 12-25-2007, 02:28 PM   #11 (permalink)
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Re: What Weight Oil in Cold Weather ?

Not sure how much better delvac 1 is over Rotella T synthetic. Rotella is only $15 per gal.
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Old 12-26-2007, 08:00 PM   #12 (permalink)
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Re: What Weight Oil in Cold Weather ?

i used to use the Mobil 1 Delvac 5w-40 when i worked my last job... they had it on the reel for the heavy equipment so we used it in our trucks... i used it year round and had no problems, summer or winter... i had better starting then, than with the motorcraft 10w-30 im using now. the one time i really used my truck and did some heavy pulling on some steep grades, in 85 degree, high humidity weather, the oil temp was at 225 and the engine at 226.. but thats the high as it got... "12,000 lbs, 33 lbs of boost, 3 gear locked TC, floored, going up hill at 69 MPH"= heavy towing im my definition..
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Old 12-26-2007, 08:48 PM   #13 (permalink)
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Re: What Weight Oil in Cold Weather ?

10W-30 is good to 0F to -10F in the 6.0L. Below that and you want to use a 5W oil. 5W-40 Rotella at $15 a gallon makes sense there.
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