Re: 100:1 Mix
Can not say I have experience with opti. As for sabre. I've been running 100:1 in 35 stihl 4mix blowers and whackers. As for lube related failures only 2 seized at the wrist pin this season when I tear them Down plenty of oil in low end. As for carbon buildup wohhhh no good even at that ratio I'm still tearing them Down every 3 mo... they basically run wide open 8hrs a day tho the carbon holds the valves open.