RE: after run oil
If you want to store your engine for a long period of time I would suggest dip your engine in Methnol for a day or two and then generously flood it with WD-40 and store it for as long as you want.
I also spray a few drops of WD-40 in carb after every flight this keeps the engine clean and reduces varnish build up Plus it keeps the bearings runnign freely like new.