I am on my second optimax, this one is an 09 250 pro XS. i only run merc synthetic optimax or DFI 2 cycle oil, and run the green/blue(i'm colorblind) stabill in all my fuel. I know the yami hammer guys all advocate ringfree or seafoam, but I do not hear those things mentioned much around the black engines. is there a need to run those additives if you are burning the synthetic oils or not?I would appreciate your experiences with this.