Davs!

I don't know about the ML-70, but why would you want to add castor oil to Aerosave?
For my engines (2- and 4-strokes) my standard mixture nowadays is 10% nitro / 15% Aerosave and the reminder methanol. It is my (and my fellow club mates) experience there is no need to add castor unless you plan to abuse your engines with extreme lean runs and/or poor cooling.