So my 16 year-old son was given a 97 Ram 2500 with the 12 valve Cummins diesel by my wife's uncle. Great truck, everything stock but the wheels, with only 155,000 miles on it. We are nearing the point where we need to change the oil, and I need some recommendations. I can get the oil filter from Advance or Autozone (they had the mopar and a couple other brands of filters for it from $13-15. Then there is oil... I have never had a diesel before, and it looks like most use Shell Rotella but what type? I mean there is Rotella T, synthetic blend and full synthetic. I use full synthetic in my 6.2 Chevy gasser, but the cummins looks like it is basically a tractor engine that Dodge decided to stuff in a truck. So what kind of oil does the diesel crowd here recommend?