Doc life span

[Dcolumbia]

Buddy just blew a turbo on his dd15, which I do think has a better life span than the Cummins system does, at 800,000 miles. I asked if he cleaned the filter and doc, said that he had no oil in the exhaust side. Lasted two weeks, sitting in the shop now with oil soaked dpf and doc temps that won't go over 365 degrees. 4900$ later he will be back in the road tonight with a new doc and dpf filter. So how long is the life expectancy? Until you start having problems. There are set intervals you should service them in a perfect situation but let's face it, these systems fail more often because of other system failures like egr, turbo egr cooler, dozer nozzle failure. They are too costly for the o/o and are killing them left and right. I will never own a truck with a working aftertreatment system again. Just my thoughts.