15W-40 or 5W-40??? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 09-10-2009, 04:41 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, 04:44 AM
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I live in OH and run nothing but 15-40

Dale

99.5 F 350 Totaled
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post #3 of 10 Old 09-10-2009, 05:26 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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'06 True Blue/Silver 250 crew cab
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post #4 of 10 Old 09-10-2009, 05:49 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


2006 F350 SOLD
* KMC XD Monsters wrapped in Hankook ATM's
* 08 style mirrors
* 4" TB exhaust
* SCT X2 with Gearhead, PHP and ID tunes
* Edge Insight CTS
*Full Bulletproof Diesel kit with remote oil cooler
* Blue FPR spring
* 6.4 Banjos
* Repaired FICM by BPD
* Dfuser coolant filter
* Stage1 MTW turbo



New truck has a Cummins and a handshaker
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post #5 of 10 Old 09-10-2009, 11:29 AM
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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!!

Early 99 F250
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-58F, 250k+ miles and still Powerstroke (7.3)Loyal
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post #6 of 10 Old 10-17-2009, 05:25 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, 04:06 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.

2000 F-250 XLT Crew cab 4x4
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post #8 of 10 Old 10-18-2009, 01:53 PM
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Mobil 1 Turo Diesel Truck 5w40....you will be VERY happy with the cold weather performance

'07 F-250 PSD 4x4 . S&B, 5" exhaust, zoodad, blue spring, '03 Turbo, 6.4 starter, 2.5 f/coils, adj Trac bar, 2" r/add-a-leafs, egr delete, DC 185 alt, Procomp shocks, SCT SF3 tuner, F-Detroit Truetrac, R-Detroit Locker, 4:10 gears, LT315/70r17 Duratracs, Amsoil Gear lube, Amsoil FE ATF, Delo 400 LE 5w30 diesel, Delo ELC, archoil 9100/ar6200, bpd ficm, arp studs, oem gaskets, HD water pump, stc, plugs, stand pipes, 6.4 banjo bolts, monitor, new oil cooler, coolant filter
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post #9 of 10 Old 10-19-2009, 04:26 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
* KMC XD Monsters wrapped in Hankook ATM's
* 08 style mirrors
* 4" TB exhaust
* SCT X2 with Gearhead, PHP and ID tunes
* Edge Insight CTS
*Full Bulletproof Diesel kit with remote oil cooler
* Blue FPR spring
* 6.4 Banjos
* Repaired FICM by BPD
* Dfuser coolant filter
* Stage1 MTW turbo



New truck has a Cummins and a handshaker
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post #10 of 10 Old 10-22-2009, 03:48 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.


2005 F350 FX4 CC LB LARIAT 6.0L Diesel -SOLD
2012 F350 4X$ CC LB LARIAT 6.7L Scorpion
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