opti-2 is a synthetic oil,intended for near 100:1 ratio.
i sold and used it for years,but i would run a quality non-synthetic for break-in,simply that opti mixed any richer will foul the plug,and plug the screen in the exhaust.
i have seen exhaust screens in chainsaws blocked solid from running with a rich opti-2 mixture.
at 20:1 opti mix,i bet the screen plugs and black slime drips out of the exhaust.
i sold and used it for years,but i would run a quality non-synthetic for break-in,simply that opti mixed any richer will foul the plug,and plug the screen in the exhaust.
i have seen exhaust screens in chainsaws blocked solid from running with a rich opti-2 mixture.
at 20:1 opti mix,i bet the screen plugs and black slime drips out of the exhaust.