I think the jury may still be out on 2 stroke oil added to diesel....
Be aware that some 2 stroke oils have octane boosters which are the opposite of what a diesel wants
I have several gallons of 2 stroke oils left over from my 2 stroke outboard days...I've played with some in the diesel fuel in the pickup and it does indeed seem to run quieter but I'm not convinced it is a good idea yet...
Be aware that some 2 stroke oils have octane boosters which are the opposite of what a diesel wants