The teardown of three failed fifth-generation Cummins 6.7-liter diesel engines–which are found exclusively in Ram 2500, 3500, 4500, and 5500 trucks–found the same issues in all three. Cummins changed the valvetrain in the 6.7’s fifth generation design in order to eliminate a necessary 150,000-mile maintenance interval. In doing so, says Dave Bell of Dave’s Auto Center in Centerville, Utah, Cummins may have introduced a fatal reliability flaw into the 6.7.
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