Most people that I know who fly with Saitos including myself use 20/20. All synthetic or castor/synthetic mix. Don't go less on oil. Stay above 15%!!!

If you find an all synthetic 16%-18% oil you can add 1-2 ounces of castor to get to 20%. Either way you should keep a 1/2 gallon bottle of castor oil on hand. It's good to have.

15-20% Nitro is good for any Saito. I don't think I would run 10%. I also know several people that run 30% heli ... but I think that is just a waste of money for this plane. It doesn't take that much power. Maybe if you were flying a prop jet or something that you wanted to kick the RPM as high as possible.