Easy Tiger is right.....5% seems to be what the OS91 DF likes..I use the McCoy 9 plugs and now that I am using the huge amount of extra castor oil ( seems like it to me anyway ), the plugs are lasting longer too...

I have been using Byron fuel....same problem finding Wildcat locally, or when I need fuel at the moment.

Oh---one other thing I forgot to mention, some time back there was some discusion about Larry Wolfe always adding an oz or 2 of " turbine oil " to his DF fuel. I am doing that also. So 6 oz of castor and 2 oz of turbine oil is what I have started playing with at the higher altitudes--seems to work just fine--better than before anyway.....


Rod Springer