The main reason cummins generally suck in today's market is because the engineers struggle to design a reliable dpf/def/enviro system for them. We have 1MW generators at work that have cummins motors and almost every issue they have is related to the environmental shit they've got strapped to them. Some of our company trucks have cummins and almost anytime one of those trucks come to visit my area they end up in the Dodge Garage getting def/dpf worked on (I can count at least 5 times that's happened anf we've only got maybe 10 trucks with those motors). John Deere on the other hand has figured it out pretty quickly and some of our compressors that use their engines are practically bullet proof. I'll stick to my old oil burner until it completely gives up lol
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seems like the after treatment problems are across the board with the on highway stuff anyways.