I just got this information from a post on the Escapees forum:
At the national HDT rally in Wichita, a fuel distributor said that ULSD does not meet OEM requirements for lubricity, and an additive should be added to each tank.
The post referenced a study posted on another forum (Diesel Place) that rated the additives (this is part of a very long thread BTW):
http://www.dieselplace.com/forum/sho...d.php?t=177728
Interesting, to say the least. I've been using a quart of transmission fluid in every three or four tankfuls, and I'd say that I wasn't using enough. Of course, that fluid wasn't tested, but 2 cycle oil was, and it did quite well.
Bob