Jumping into the 2500 world here shortly, but wasn't sure if I was going to go gas or diesel. I'm not familiar with diesels and the more I talk to people, the more I feel I have no clue. Besides the oil change (oil/filter) what else needs to be changed? I wasn't aware about the fuel filter till recently, but I also heard it has 3 of them. Do we change all 3 during an oil change? A little help to set me straight would be appreciated.