I just got a 2010 F-250SD and it's in perfect condition with only around 25k miles. But my dad keeps saying that his friend keeps telling him how the 6.4L engines have all these problems that are expensive to repair. So what are these problems and how much would the repairs be if they were to have to be done? Or is his friend over reacting? It's well known that he doesn't like diesels, so I figure he may just be bashing the diesel.