my brand is castrol R2
that is german stuff and i would put it on the same level as bel ray ,
cause they are also in for the best product .
i mix it at 40 to 1 and never had issues doing so,
my manual says also 32 to 1 but it seems to much oil,
since oil is taking an amount of space in the mixture,
where there is too much oil , then there,s no fuel or air there ..
mine,s smoking excessively at lower mixture,s then 40 to 1
so the whole set up is for 40 to 1
spark,s good tan looking
clean port and exhaust
and that awesome fumes of it after a ride
i stick my nose in the muffler just to check the state of the engine ,
and i,m addicted by 2smoke