One problem related to diesel engine has been reported for the 2015 Ford F-350. The most recently reported issues are listed below.
Bought truck brand new in December 2014. At approx. 5,000 (still during the diesel engine break in period) while driving thru an intersection in traffic the truck and motor started violently shaking/bucking with the motor making a loud knocking noise- the truck then had a total loss of power in which I was unable to safely accelerate. The truck then went to the dealer in which I was told they could find nothing wrong. The truck now been in an out of the shop numerous times because the problem keeps occurring. Ford released a TSB stating that its normal for their trucks to experience "rough running" during the exhaust regen cycle. The experiences that have occurred with my truck have no correlation to the regen cycle and seem to happen at random times. The truck has become dangerous to drive and pull my horses with as the shaking/bucking is so violent and with a loss of power and unable to accelerate its scary to even attempt to drive in traffic.