I've owned a few pickups over the years but never a diesel. I've dropped the semi idea and am now looking at a 1 ton Ram with a Cummins 6.7 turbo, with about 180,000 miles. I've read that at 200,000 miles you can start to have problems. Turbo problems, emission control problems, all very expensive problems. I've always thought diesel engines would run for a million miles, but now I'm wondering. Am I wrong to be cautious of a 200,000 mile truck?