Moving to Alaska in May this year and will be buying a Superduty. Which engine will be better suited to cold weather operation and extended idling, the 7.3 or the 6.4?

 

I would say the 7.3 if the 6.4 is stock, they like to grow oil when idled alot. Now if the 6.4 had a dpf delete that would be a different story.

 

6.4s can have issues with fuel diluting the engine oil because of the DPF regen cycle. None of the DPF generation trucks are particularly well suited to idling. Light duty cycles and low load states tend to fill the DPF quicker than when the truck is being worked hard.