OK I'll jump in this bar room brawl.
The purpose of the test was to study one, and only one thing: lubricity of fuel additives in an HFFR test machine. It did not test the additives in actual diesel engines, and it did not examine or look for any consequential effects to actual engines, adverse or otherwise, of additives beyond their ability to provided lubricity to fuel. It did, however, note that several of the additives were not ULSD compliant and "may damage systems," which presumably means diesel engine systems like DPFs and whatnot, although no empirical data was given to support those asides. The report also does not make any claims that additives would NOT "damage systems" just because there was no notation that it would.
Having said this, my guess is that the OP's smoke issues are due to something other than the 2-cycle oil, but who knows for sure? It is not outside the realm of possibilities that the OP's truck was operated in such a way that the 2-cycle oil contributed to higher than normal particulates in the exhaust and may have led to coking of turbo or EGR valve. Just because it didn't happen to others does not mean it can never happen. Gotta compare apples to apples and all that.
BTW, I'm going to guess that Moparman's extensive use of 2-cycle oil were on a Cummins and not a 6.0L. FWIW.
