hi,

was running well suported fuel last wkend in the nationals 1/8th ic onroad, and was struggling to tune the engine. its either have low end and no top end or vice versa. Then changed over to bryon gen 2 fuel and problem solved ! The first fuel used castor oil but not sure about bryon....oh this engine was a sirio AAC

hence my question is that oil % (castor or sythetic or mixture of both)....what would be min % for both protection and power ?

Thanks