CRASHANBURN1,

Cox fuel has 15% nitro and ~20% castor oil. Should work well in your 1/2A engines. Cox also makes "Cox Racing Fuel" which, I think, has 25% nitro. Cox fuels use (or used) 100% castor lube because it is good for the ball socket at the upper end of the connecting rod.

Use it with much enjoyment. Put the empty can on "the bay".

Speaking of old cans, I have some Topsol diesel fuel from "way back when". I may add some ether and use it up also.

George