I run 2-cycle oil in my Cummins for added lubrication of the Bosch VP44 injection pump, which is completely fuel lubricated. I don't think Bosch took either LSD or ULSD into consideration when designing the pump.
Heating 2 stroke oil in a pan is a biased test.
A mixture of fuel and a tiny percentage of 2 stroke oil when burned and exhausted is a much different scenario.