Whats the majority go with 15w40 or 5w40 - Ford Powerstroke Diesel Forum
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  #1  
Old 04-03-2008, 12:54 PM
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Whats the majority go with 15w40 or 5w40

Would I be ok to go with 5w40 or would would that be a bad idea in the 6.0 what do the techs think about 5w40 in the 6.0
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Old 04-03-2008, 01:17 PM
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Old 04-03-2008, 01:24 PM
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I use 15-40 in my 6.0
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Old 04-03-2008, 01:30 PM
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I have always heard to use 15-40 during the warm months, its thicker and provides more protection. and use 5-40 in the winter for easier startups
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Old 04-03-2008, 04:39 PM
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amsoil 5w40 for me
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Old 04-03-2008, 05:16 PM
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5-40 year round so far. Shell rotella T.
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Old 04-03-2008, 05:42 PM
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Thumbs up Oil

Amsoil AME Diesel/Marine 15w-40. 5w-40 is for 6.4/390 CID engines. (I do run 5w-40 synthetic in my 650 Arctic Cat 4-wheeler though.)
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Old 04-03-2008, 06:06 PM
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Running AMSOIL AME Diesel/Marine 15W-40 also. Newer 6.4 are required to run 5W-40 like Jerseyredneck1 states. Some are running 5W in cold-cold weather. Check the AMSOIL link and let me know if I can help
Harry Lloyd Edmonds, Jr. - Independent AMSOIL Dealer - Norfolk, Virginia
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Old 04-03-2008, 06:16 PM
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Send a message via AIM to 03f250stroke
I ran 5w20 in the winter and then 15w40 now and I think im gonna stay 15w40 year roung
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Old 04-03-2008, 06:36 PM
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I use Motorcraft 15w40 year around.
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