ORIGINAL: KeroPower
I am thinking about trying Klotz Benol instead of straight from the bean castor oil. The Fox oil is really starting to carbon up my Fox .40 RC.
Mix a gallon as you normally would, then add a few ounces of synth Klots Techniplate. I've found adding a few ounces of synth to a predominently castor mix tends to keep the carbon and varnishing down.