I have two of the early high compression Saitos, .80 and a 1.50 which I originally ran on Fox Missle Mist 15% nitro and 20% castor for about a year, then when I heard that all castor was "bad" I changed to Byron's four cycle fuel 15% nitro and 16% lube and now run them on WildCat Premium Extra 15% nitro and 18% lube of which about 2% is castor, these engines have thrived on all these fuels, but by far they run the smoothest and have the best transition on the WildCat. What I'm saying is that I agree with JAKA