Its not that simple. Are you talking biodiesel, SVO, WVO? And acutally any diesel engine can run off the above with the proper modifications.
Biodiesel can be run 100% in any diesel without problems but you will need to burn a tank or so then change your fuel filters. I am in the process of building a biodiesel processor and collecting WVO.
Waste vegetable oil can be ran straight but only after you start and warm the truck on normal diesel or biodiesel and then switch over to a second
tank and pump system.
Anyways as far as dodges go they are pretty simple.
I would buy above a 1994, as that is the beggining of the 2nd gen body styles.
1994-1998.5 is the 12 valve manual controlled fuel system, these motors are real tough and can last forever and get freat fuel mileage. You will need to replace the front timing cover as a dowel pin is faulty from the factory and have been known to fall out and ruin a motor.
1998.5-2002 is the 24 valve electronic controlled fuel system. The lift pumps on these trucks are bad to go and that causes the injector pump to fail. An injector pump is a $1500.00 repair. I put an aftermarkey lift pump on my truck and that takes care of that problem.
I dont know much of the new trucks.
Ideally a low milage, clean 12 valve with a 5 speed will be your best all around truck. But they are hard to find.