I am in same shoe, sort of set on the diesel,
and with the 2008 6.0 deisel engine still in production, don't know whether it still needs thats ulsd fuel...
i haven't picked up phone to ask smb or Ford as i am not yet ready to order my smb
All new diesels require ULSD, and that's pretty much all that's even available, in the US. Mexico is a different story.
Herb
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SMB-less as of 02/04/2012. Our savings account is richer, but our adventures are poorer.