WE had this 2004 Ram Cummins at my old job.. 5.9.. I betya they might not have changed the oil in it every 30,000 miles.. and it got multiple drivers a day, people would leave it running for hours while not driving it,, beat to death.. it was past 200,000 city miles when I retired, thing wouldn't quit.. basically, if a person takes care of a Cummins ISB I'd be willing to bet it will last 800,000 miles or more becaue I know a couple people with Ram Cummins who are close to a million miles. So dont worry about what isn't your truck is my thoughts.
View attachment 158196