Search for Mopar1973man on this site. He as done many testing on all kinds of additive's.
I do the sameI do a quart every fill up...then once in awhile skip a fill, just to be sure it's not "over oiled"..
Synthetic 2 cycle oil can be used with out any problems if a person wants to spend the money for it. FYI, Duluth Diesel has been using Amsoil synthetic 2 cycle oil in his truck for 1.5 years now and has posted severals times about using it. So please don't tell people not to use Synthetic 2 cycle oil because it can be used with out any problems.