#2 or heating oil is better than reg. diesel the more sulpher the better lubricating property's (better for the fuel pump etc.). Easy way to sum it up, think about all the farmers out there, thats what they run. It's probably not good for the cat, but you can fix that, as far as filters just do...
Just got my truck back yesterday from the dealer for the engine leak. They said it was a leaky cam position sensor. It took the dealer 8 days to replace the instrument cluster and fix the leak.