Just wondering aloud here - what if a guy was to thoroughly flush out an engine with FAI fuel (20% oil, 80% alcohol) with castor oil fuel prior to storage. Would the alcohol evaporate, leaving the castor behind? Sure, I know, old castor oil gets gummy, but it'll flush out. I'm more interested in preserving bearings, etc, and I haven't been too awful impressed with the after run oils I've used (Prather, mostly).

Any thoughts? I have several engines in a "collection" that I'd like to do a better job of preserving, without having to spend lots of time on a regular basis checking them.