Air tool oil or transmission fluid are good after run oil. The methanol left over in the crankcase is the source of corrosion as methanol is hygroscopic and will absorb moisture from the atmosphere and will cause bearing corrosion. Start and run the engine wide open throttle with the fuel line disconnected at the carburetor to remove as much as possible the methanol left over in the crankcase. After running the engine with the fuel line to the carburetor disconnected, leave the fuel line disconnected and then you squirt after run oil into the carburetor and spin with the starter for about 3 seconds, then squirt again into the carburetor and spin the starter doing it 3 times more the squirting and spinning to circulate well the after run oil into the front and rear bearings. That should coat the bearings with enough after run oil. Corrosion from methanol left over in the crankcase is a big killer of bearings. Leave the fuel line disconnected at the carburetor and plug the fuel line with a fuel dot or something handy and plug the carburetor nipple as well to prevent dirt getting into your carburetor, as you don't want any siphoning of the fuel from the fuel tank to the carburetor and down into the crankcase again. 'Nuff said. Larry.