RE: After Run Oil
What I was instructed to do was to pump out the fuel from the tank then run the engine until it stops. Then, try to start it again just to make sure all of the fuel was out of the engine. Then, fill up the carb with the oil, turn the prop a couple of turns then repeat the process 2-3 times. This makes sure that no fuel is in the engine and that the oil is thoroughly in the engine.
I use Marvel Mystery Oil as that is what most of the chaps I spend time with use.