i been running that golden spectro synthetic blend cause i got it for free
it runs awesome i havent changed my sparkplug in like 500 miles
i also have pretty good luck with red spectro racing oil mixed around 70:1 also got for free 2 gallons
but this stuff is pretty old i dont know if they even sell it anymore
what ever happened to optimus racing oil i used to use that stuff all the time and it ran so nice with almost no smoke
now i cant find it anymore