I think Kingtech engines are sensitive to certain brands of oil. I ran out of turbine fuel and use a friend of mine's fuel but after the flight my engine wouldn't cool down and turning the compressor by hand feels gummy, I quickly drain the last 50 ounce out of my tank and ran it thru which fix the problem. Not sure what brand oil my friend was using.

P.S Because of the gum-up bearing during start-up will cause excessive flames but will start eventually.