I ran home brew 65% for drag at 7% total oil , 4% castor /3 % ester based
and 65% in speed car at 7% oil but 5% castor and 2% ester based oil with success … just don’t lean the motor much for the speed run cars esp if over 240 degrees .
just make sure you monitor the plugs after you shim the engines to run correctly . Give em hell!!!