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Ford dropped it (the 7.3) because Navistar (who was the manufacturer) was problematic with warranty claims. Ford took it in-house and now builds their own diesel which is 6.7 litres (409 cu in). Very innovative design and high tech and so far it has proven to have good longevity also. Cummings (Ram) and Isuzu (Chevy) are pretty good engines as well. I think it's really a matter of personal preference as all the newer engines seem to be over the issues that were generated by emissions requirements. I have a 2014 that is pretty sweet.
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