I agree with downunder, if you get a synthetic oil, be sure it has some castor in it, from about 20% of the oil to half of the oil as castor and 10% nitromethane is fine for sport flying. If you want to strap on an UltraThrust muffler or pipe later on, a fuel with 18-20% oil and 10-15% nitromethane can still be used for a little more power and some 1200-1500 rpm or so. Glad to see folks interested in just what their engine will use for a good long life and good starting and performance.