[larry337]

I've owned both. My 6.4 was a reliable motor with plenty of power. But the emissions is horrible. They regens frequently, like all the time. The fuel mileage is horrible. The early 08's had radiator issues. The only way I'd consider that one is I'd you delete the DPF and run a mild tune. If you do that it would be a serious option, fuel economy and power would be similar to a 6.7. They are both smooth and sweet running engines. But the 6.7 has a smoother 6 speed auto and better electronics in the gauges. No payments is definitely a plus.

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