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It is probably LSD, and not the ULSD that these call for. I do not know the exact stance from Ford on this (dont own this oil burner), but I have to believe its not the best to run it for any extended period.
I was told by a service manager at a ford dealer that ONE tank is all that can be tolerated by the 6.4, when they first came out they had some problems with companies that still had LSD in there storage tanks and used it in the 6.4. Not sure on how true it is but he said it will create some problems from what hes seen