Ford Powerstroke Diesel Forum banner

1 - 20 of 30 Posts

·
Registered
Joined
·
999 Posts
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
 

·
Registered
Joined
·
1,933 Posts
I use 15-40 in my 6.0
 

·
Premium Member
Joined
·
4,937 Posts
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
 

·
Registered
Joined
·
813 Posts
amsoil 5w40 for me
 

·
Registered
Joined
·
68 Posts
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:
 

·
Rice Hunter
Joined
·
4,036 Posts

·
Registered
Joined
·
3,720 Posts
I ran 5w20 in the winter and then 15w40 now and I think im gonna stay 15w40 year roung
 

·
Premium Member
Joined
·
31,729 Posts
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
 

·
Registered
Joined
·
1,542 Posts
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.
 

·
Registered
Joined
·
999 Posts
Discussion Starter · #14 ·
So 5w 40 would work year round.
 

·
Registered
Joined
·
361 Posts
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...
 

·
Premium Member
Joined
·
11,219 Posts
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..
 

·
Served Our Country!
Joined
·
196 Posts
I'm probably going with Amsoil 5w40 on my next oil change.
 
1 - 20 of 30 Posts
Top