ORIGINAL: FatOrangeKat
I am wondering how much castor oil to add to a half-gallon of Tower fuel for breaking-in my OS 46AX.
I have a half-gallon fuel mixing jug, and a bunch of quarts of Tower fuel, which is 10% Nitromethane and 18% synthetic lubricant. I heard somewhere that you can add an ounce or two of castor to increase the oil content, and to add a more protective oil to the blend.
How much castor to add?
None
The engine will break in perfectly if you use that fuel and do what the instructions in the manual suggest.
I've lost count of the number I've done for guys at the field and done a number of my own. It's a product that does what it's advertised to do. It breaks in excellently well on just a run or two, doing the needle twiddling that the book suggests.
Every one that we've broken in as recommended is still running like gangbusters. A number of them are going on 3 years old.