Right I agree with you. I have heard rumor of a large company called cummins that produces an isx and some other motors over the years.
The oil change intervals have gone up dramatically. I had two lease trucks from pac lease with paccar motors and they wanted them every 25k for service, that's what they wanted. They were great engines for the 6 months we had them, zero problems and 6mpg or better in the aggregate hauling business
No they were lease trucks through pac lease so that was their department. We do 25k on our new dd13 motors and the dealership is telling me to go 35k and it should be fine.