The 350k on a set of jerk pump injectors is neither impressive nor unusual. In fact, if that is all they run extra lube and filtration could be a benefit.
200k on a CR injector is the equivalent of about 500k on a jerk pump while dealing with 3 times as much pressure and fouling from asphaltenes that is not as critical in older systems.
Ultimately the measure of an injector is its efficacy to do its job. That has a whole different set of contributory parameters than just total miles. There is no "mystery" to fuel additives that enhance the life expectancy. Added lube, periodic cleaning of the whole fuel system, added filtration, etc., has proven to be effective and even endorsed by Cummins in the CR systems. Cummins, Bosch, and Ram did not adopt fuel quality requirement son a whim, they just finally caught up to what al other segments of the diesel industry did as a rule.
200k on a CR injector is the equivalent of about 500k on a jerk pump while dealing with 3 times as much pressure and fouling from asphaltenes that is not as critical in older systems.
Ultimately the measure of an injector is its efficacy to do its job. That has a whole different set of contributory parameters than just total miles. There is no "mystery" to fuel additives that enhance the life expectancy. Added lube, periodic cleaning of the whole fuel system, added filtration, etc., has proven to be effective and even endorsed by Cummins in the CR systems. Cummins, Bosch, and Ram did not adopt fuel quality requirement son a whim, they just finally caught up to what al other segments of the diesel industry did as a rule.