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