Skeptics love to argue that modern heavy-duty trucks are too complicated to last. Between high-pressure common-rail fuel systems, diesel particulate filters, selective catalytic reduction, and layers of electronics that would have seemed like science fiction two decades ago, there is no shortage of ammunition for that argument. But real-world evidence keeps pushing back — because more than one 6.6-liter Duramax-powered Silverado HD has quietly rolled past the million-mile mark with its original drivetrain intact, and that changes the conversation entirely.
