I suspect that part of the run around is because of how this was handled at the time. I am going by my not so great memory here, but as I remember the problem was a piston supplier defect, and rather than do a recall or some form of one time inspection of all engines, DD just paid for the repair or replacement of any engine that failed as a result of the piston issue.

I saw one that was ready for return to DD, and the block was so badly damaged the truck it came out of got a new engine. Both the parts man and the mechanic were very open in discussing that DD was picking up the cost, and about the cause of the engine failure. I'm sure there is some paper work out there that covers this because the typical DD shoip is not going to replace engines for free if it was a manufacturing defect. Some documentation is available, but it will take some digging because this is a seven to ten year old issue.