Every Ford diesel previous to the 6.7 is a crapshoot if not a downright mistake.
We'll get some folks chiming about how with this mod or that mod they can be made reliable, but I ain't a believer.
if you aren't buying the 6.7, go Duramax.
Oh, and that loudass Cummins sucks, too.
(just to make sure I piss off everybody