I know I haven't posted in years
but I plan to more often as my other place deletes all posts after three years and locks them after a year.
I got this link from another friend who participates on Diesel place.
They had a lab do controlled tests on the same plain dry diesel with no additives to expressly find if any were actually increasing the lubricity of the Diesel fuel which makes all the difference in the world to our engine's lifespan.
This is on a forum, not commercial, and with nothing for sale.
Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums