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I would pick the 6.7 powerstroke hands down over anything on the market right now.
The triton engines weren't very good in my opinion. The famous design issues you hear so much about and high maintenance costs
Correction, Ford had about 7 1/2 years of chappy diesel engines. Starting with the 6.0 in 03.5 and ending with the 6.4 in 10. And it was mainly just 03.5-07 with the 6.0 that was the worst. The previous 7.3, and the later 6.7 are solid motors. I wouldn't own the new cummins 6.7, not near the motor the famous 5.9 was.
The 6.7 Powerstroke's have been great. Cummins is also a great engine. I wouldn't be worried about either. No way would I run a v10. Why bother with single digit gas mileage? People used to do it to get away from the stink and the noise of the diesels, but that doesn't apply anymore.Both diesel brands will use DEF, which is another pain in the butt.