Cats have got to be the most worthless engines ever made. Well, the older ones were okay. However, the ones produced in the past 10 years are at best awful. In trucks, they cost the most maintain and they get the worst fuel mileage bar none. They're so bad in fact that by I believe 2010 you won't even be able to get a Kenworth or Peterbilt with one because they are going to stop using them. Their sales have dropped significantly because of their "marriage" to Cat. The bearrings in Cat engines are so soft that their fail safe in the event an injector goes bad has diesel being pumped into the radiator rather than the crankcase. I've been around just about every diesel ever made, and I will confidently say that Cats are by far the worst engines around.