15W-40 or 5W-40??? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 09-10-2009, 05:41 AM Thread Starter
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Question 15W-40 or 5W-40???

Just wondering what weight you guys think I should use. I live in Maryland and it gets pretty cold in the winters sometimes, just not sure which would be the best for my truck. Any help would be great, thanks.
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post #2 of 10 Old 09-10-2009, 05:44 AM
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I live in OH and run nothing but 15-40

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post #3 of 10 Old 09-10-2009, 06:26 AM
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Since you're obviously talking about a synthetic my vote is for 5w-40. I run it year round. Hot summers and butt cold winters with no issues. Cold starts are much better than 15w-40 dino oil, but I've never tried 15w-40 synthetic. I can tell you my 6.0 loves the synthetic...

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post #4 of 10 Old 09-10-2009, 06:49 AM
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Quote:
Originally Posted by shu873 View Post
Since you're obviously talking about a synthetic my vote is for 5w-40. I run it year round. Hot summers and butt cold winters with no issues. Cold starts are much better than 15w-40 dino oil, but I've never tried 15w-40 synthetic. I can tell you my 6.0 loves the synthetic...
............. I use Rotella 5-40 synthetic


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* Blue FPR spring
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post #5 of 10 Old 09-10-2009, 12:29 PM
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5-40 Synthetic here

I use the Rotella 5-40 synthetic year round here in Fairbanks... during winter it really pays... I would use a 15-40 synthetic during the summer but I can't find it anywhere, so rather than mix dino and synthetic every fall/spring, I just stick to my synthetic... definitely quieted it down a bit during winter!!

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post #6 of 10 Old 10-17-2009, 06:25 PM
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I would have to agree on the 5w-40 syn. I run Mobil 1 its just readily available for me in CT. Would love to run Amsoil but I just haven't looked for a distributor yet.
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post #7 of 10 Old 10-18-2009, 05:06 AM
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I am runnin 5W-30 Amsoil. I figured the thinner the oil I run in the winter the better. It was about 30 degrees here last night.

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post #8 of 10 Old 10-18-2009, 02:53 PM
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Mobil 1 Turo Diesel Truck 5w40....you will be VERY happy with the cold weather performance


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5" exhaust, zoodad, blue spring, Airaid intake, 6.4 starter, 2.5 f/coils, adj Trac bar, 2" r/add-a-leafs, egr delete, snow plow fan clutch, csf 6028 intercoolerr, DC 185 alt, Bilstein 5100, Barder '03 turbo rebuild w/RR billet wheel, SCT SF3 tuner, F-Detroit Truetrac, R-Detroit Locker, 4:10 gears, hawk LTS, LT315/70r17 Duratracs, Amsoil Gear lube, Delo 400 LE 5w30 diesel, Delo ELC, archoil, bpd ficm, BPD oil cooler, dynatrac pro steer ball joints, arp studs, oem gaskets, HD water pump, stc, plugs, stand pipes, 6.4 banjo bolts,
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post #9 of 10 Old 10-19-2009, 05:26 AM
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I now run Valvoline Extreme Blue 5-40 . I have Valvoline in everything I own now, they're my favorite oil maker


2006 F350 SOLD
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* 4" TB exhaust
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* Dfuser coolant filter
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New truck has a Cummins and a handshaker
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post #10 of 10 Old 10-22-2009, 04:48 AM
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Ive been running the Amsoil 5w-40 since I got the truck. Im gonna switch to the 15w-40 here soon. Compare the difference.


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