I use Marvel Mystery oil for after run if I use it at all. Many of the store bought Rc specific After run oils I've bought over the years end up being nothing but Marvel mystery oil or trans fluid.
edit...
marvel mystery oil.
http://www.autobarn.net/chmm013.html
-- John --
1:1.. 01 Z28 Camaro A4 Sure.. its stock.
1:8's.. K3, Inferno GT, and a straight line beater car
1:18.. RC18t Mamba and 3s lipo