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Using this site as an indicator of the 6.7s reliability, I am confident that we have a good engine. The lack of serious problems with the 6.7 far exceeds the 6.0/6.4 Navi. I personaly know of a 6.7 cab chassis that went down from running on jet fuel while being used as an airport maintenance truck, the teardown looked similar to the one in the video. The warranty was denied on that one. Don't think I'll worry too much about mine though.