We are a logging company and I can't believe the trouble we have had with our 6 and 6.4 F350 and F450 pickups they are in the shop constantly. I drive a 2008 F450 it has less than 50,000 km and it has been in for warrenty repairs for a total of 12 days and has left me stranded in the bush twice so far
our 2006 F350 is no better.

The radiator in the 450 failed at 40000 k and was not covered now there is anti freez in the oil due to an internal failure of the oil cooler -7 days to repair
Not bad for an $80,000 truck!