After run oil in OS engine carb.
In the OS manual it statrs " do not pour after run oil down the carb throat because it will damage the o-rings ".
I have been using 8-9 drops of Marvel air-tool oil down the throat of my engines for many years and am not sure if I have damage to the o-rings.I am not disputing the OS people, I just want some opinions from fellow fliers.
Thanks Varmit