I suck the tank dry with the fuel pump and put it away. I have never used after run oil in 25 years, unless like minn flyer stated, I was putting one away for a long time. I use Marvel Mystery oil for that, although there are probably better oils out there. I have never lost a bearing or never had an engine go bad. I still have some of my very old engines that were all taken care of this way and they are all in great condition. I do clean them from time to time to keep the oil from building up on the outside. I don't like black burned on oil on my engines. Most of the guys at our field are insistant on burning out the left over fuel and using after run oil, but as my full scale mechanic states, when you burn out the exess fuel, the engine goes really lean. He fully believes that it is harder on the engine to do that than to leave the fuel in the engine, because it has as much lube as the oil you are puting in and you don't heat things up. Probably not enought to hurt it, but like I said, I have never lost a bearing, and the guys who run the fuel out are always buying bearings.