[Redneck47441]

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

 

[Banshee34]

:bump::bump::bump::bump::bump::bump::bump:

 

[fordmugg]

I use 15-40 in my 6.0

 

[stroken04]

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

 

[fordfan30]

amsoil 5w40 for me

 

[JBakerFX4]

5-40 year round so far. Shell rotella T.

 

[jerseyredneck1]

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:

 

[Diesel Freak]

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

 

[03f250stroke]

I ran 5w20 in the winter and then 15w40 now and I think im gonna stay 15w40 year roung

 

[CLIPPERS]

I use Motorcraft 15w40 year around.

 

[bismic]

Schaeffer 9000 5W40 year round.

 

[Dave]

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

 

[JBakerFX4]

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.

 

[Redneck47441]

So 5w 40 would work year round.

 

[bismic]

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

 

[06TWO50Diesel]

I just did a change and used 15w40 Castrol GTX. They had it, had a lot of it, I needed a lot and now we're good. I use 15w all year round

 

[robert smith]

5-40 is only recommended for temps under 32*, according to the people who wrote the '07 manual-but what do they know?

 

[bigwhite6oh]

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...

 

[HeavyAssault]

Mobil 1 5w-40 here. I have tried Syn Rot-T and Amsoil, so far the Mobil 1 has been the best of all three..

 

[Tailboard Jockey]

I'm probably going with Amsoil 5w40 on my next oil change.