I have an 06 F350 6.0 and it has served fair. Dropped a glow plug in cylinder at 60k and the motor was replaced. Had it bulletproofed and have had great luck since. Tows and hauls great. Both motors like a lot of attention. Oil and fuel additives seem to be a must. Oil changes (DIY) with full synthetic Delo and Rev-X run about $180. We use Optilube fuel additive and have had great luck with the combo regarding injectors. It is more expensive to run/maintain than our 7.3 or Dodge were. We run a lot of miles. my next one will be the 6.7, if the current positive feedback continues.