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My son owns and operates an engine rebuild shop and a all around mechanical repair garage. And from what I see coming in for major or minor repairs are older higher milage vehicles that are out of warranty. May just be luck of the draw but the older 7.3PS that I've seen is some injector troubles. The 6.0PS head gaskets, injectors,a few engines. The duramax few head head gaskets, quite a few injectors for some reason, and some drive line problems mostly fr.diff. and transfer case. The 5.9 cummins maybe just by chance he doesn't see them. And one more that I've been impressed with is the 8100 chevy gas engine, I have saw a few of them with 300 + thousand miles no trouble and the ones I have driven run excellent. I personally tow with 5.9 cummins 2500 been well satisfied once I come to the conclusion that I just don't get the fuel milage that others do.
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