You are not pushing your luck with BD.
Your truck will like it better than #2
Ford has not used rubber lines, seals, or O-rings for quite some time so that is not a problem.

Coking with unheated VO is a problem with ALL modern diesels not just the 6.0, your friend has been lucky so far but is likely to take a hard fall in the future.

Like I said before if you want the research paper PM your e-mail addy