just curious what types of oil you guys are running in the 6.4....

 

I use the 15-40 as I tow alot. Motorcraft is it. I will probably switch to 5-40 after I get back from GA by the end of the month.

 

15w40 Motorcraft and nothing else. Motorcraft Filter also, stay with what works for me.

 

Got 10w-30 in now but am switching to 5w-40 very soon. (Rotella T6)

 

Rotella T Full Synthetic 5W-40 the only way i would go with what i do with my truck.

 

Dealer put 10-30 in it last oil change. Said that is their new, year-round oil unless I move to Alaska or Minnesota. I asked "What about Wisconsin?" and he said 10-30...Apparently he's clueless on basic geography.

 

172 views and only 25 poll replies?????

 

I use Rotella 5w40 .

 

bump............

 

I use full synthetic 15w40. I live and work in a cold climate in the winter (-40C) and anything that can help in that cold is worth it's weight in gold.

 

Curious why you wouldnt go with something lighter? 5w40 or even 0w40? (or 10w30)

 

I hope its not scamsoil!

 

No it's not Amsoil, heard too many horror stories, I run Shell Rotella. Longview I have always run 15w40 on the advice of several people and several dealers. I thought about going lighter in the winter but it's been performing great for me and I don't like the idea of changing back and forth from lighter to heavier oil and prefer to stick to one.

 

Fair enough, as long as its working then I agree, no need to change.
I think once I switch to 5w-40 (rotella t6) im gonna stay with it, even in summer.

 

Brandon, do you mean full synthetic 5w40 or standard 15w40? I don't see Shell making a full synthetic 15w40.

We buy Rotella T 15w40 by the drum, I know you guys are pretty wrapped up in your pickups, but we have to protect $325k Deere 9770STS Combines and Shell does that for us. When you have a 2 million dollar wheat and barley crop on the line, you can't cut corners.