I ran a straight synthetic fuel similar to cruel power,sorry.....COOL power and my saito 125 developed an annoying sweaking sound that I thought was my front bearing. I started running fuel with some castor in it similar to omega and not only did my engine run just as good,it hasnt squeaked since!!!!!
Run the Omega for sure! And another great thing about alittle castor most people seem to not appreciate is that its a GREAT rust preventer! Some (including me) say that synthetic oil actually accelerates rust because of the way it works(technical stuff....).
But,if you do run cool power,you'll probly be just fine too