About 2 stroke oils and premix.

Castrol R the best 2 cycle oil ever made , better since it been degummed.
I won 7 WKA Kart Roadracing Championships using it in KT -100 Yamaha engines... 12,000 rpms.... Komet K80 ...15,000 rpms and Pirillia TT75 engines 18,000 rpms. All motors built and maintained by me.