I have to be "that guy" . I'm driving a 6.7 Cummins. It has 203,000 miles on it. I upgraded the torque converter before it gave any problems and all the emissions have been deleted. In 203,000 miles, it has only been routine maintenance until last month. At 200,000 miles the ac compressor went out. That is it! I've had 2 others. They were both 5.9s. Drove all of them to between 160,000 and 200,000 miles. Out of both of them, I upgraded the transmissions before having problems, a few unit bearings in the front ends and 1 water pump. Never a motor issue.