ISX15-CM2250 running rough cold help?

[Pd6cas2]

Side Note here;;;I was in Cummins Shop San Antonio,Tx buying parts..Coolant filter and shut off valve o-ring for the coolant filter, Im installing an Espar Coolant heater and draining all coolant with fresh Coolant!
I was overhearing a Service advisor telling a owner operator with 454k’ You most likely have a Blown valve because compression is coming up thru the valve cover and mechanic recommends Overhaul , He was pissed’ How can it be that and engine can’t last 500k before and overhaul’ screw that I’m going out off business’ this is ridiculous ..
I feel for these guys’

Another one of My friends had better luck ‘ 2018 Kenworth X15 performance with 550 hpr just had total out frame by Cummins White Bear Lake, Mn $45,890.00
Camshaft Lobes were the original problem but He let it go kept running and it tore the rest of the engine up..