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Discussion Starter #1
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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I use 15-40 in my 6.0
 

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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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amsoil 5w40 for me
 

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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.):icon_ford:
 

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Schaeffer 9000 5W40 year round.
 

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Going to 5w40 amsoil year round here. When looking at this remember how oil viscosity is measured. the 5w and 15w are cold weights. The 40 is the lubrication at operating temp. So when its warm the 5w40 and 15w40 are the same. the 15w is just thicker in cold temps
 

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so far I've been very happy with my 5-40 Rotella. I have about 4k on it and the truck is still running good. Before I had 5k on Castrol and my MPG's fell like a rock after 4k, and it was getting loud. Switched to the rotell and haven't looked back since. hoping to get 5-6k out of my rotella.
 

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Discussion Starter #14
So 5w 40 would work year round.
 

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That is certainly my opinion. So far my UOA have all looked good.
 

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im running rotella 15w40 now, but in my search for AMSOIL synthetic, i was recommended the HDD 5w30 year round being up in NH because of the varying temps throughout the year here.
subbed to hear more input...
 
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