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Honus if offering good advice. The 6.4 with its twin turbo's is not noted for fuel economy- you may as well just buy the V10. Even the new 6.7 Ford has its issues in the 450-550 application with valve failures. It also has two water pumps- one of which requires disassembly of the front of the engine to change. I've enclosed a few pictures of a 6.7 from the Truck Nationals at Carlisle several weeks ago. Note the 4 pushrods per cylinder.
If you want the real deal, save up for a '14 Ram 3500 SRW with its 850 ft./lbs of torque, its available Aisin transmission, and its rear air suspension. The 6.7 Cummins that is now using DEF is a stellar performer and is offering fuel economy that was only dreamed about several years ago.
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'83 300D, 126K miles.
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