Do you use the XLF or the premium plus?Pennzoil on amazon for 17$ a gallon shipped. I run 36:1 in my mildly modified SJ.
And even more conveniently a half quart is one red solo cup.A stock superjet is an extremely mild motor and not very demanding on oil. I also would use the cheap stuff as long as it's tcw3. I mix 40:1 because it's convenient half quart in a five gallon jug