Any good quality two stroke oil with JASO/FB/FC approval will do the job. I have even used PSO and Shell 2t oil and never faced any issue. Ive used 250ml for a full tank , pour it in before filling up and it will mix nicely. Ive stepped down to 100ml per tank after the Sohn was installed. Right now im using Emarat 2t which i got in dubai , this is the best oil even the exhausts stay clean.
The only thing to worry about is the cat converter if you have one , mine came with the cat removed and anti-fouler no CEL mod installed already from japan. If you get your cat removed after it gets choked because of premixing , you will get a CEL light.
I got the sohn made here , there is a seperate resevoir attached to it filled with 2t oil which burn much cleaner than engine oil and now i can run synthetic oil without issues , engine oil level will not decrease either.