My favorite homemade afterun oil. 1/2 automatic transmission fluid and 1/2 Marvel Mystery air tool oil. Doesn't gum up, or dry out, just leaves a nice oily protected surface. Like I read in another post, "you don't find automatic transmissions corrodded, its because of the AT fluid". The Marvel Mystery air tool oil is good because our motor are very similar to air tools. So both oils mixed together, have an affect of preserving. Check it out. Do a search. Make just one batch, and you'll have plenty for years. Good flying to you.

Tom