I use a lot of ARO when I'm storing an engine, but I don't put a plug in it. I take apart and clean the entire engine inside and out with DA, including the carb, OWB... Then I lube it liberally with ARO all over the bearings, few drops on the carb as I put it back together, the conrod ends, piston/cylinder wall, lube the OWB with 3-in-1, seal the backplate, carb neck, carb banjo fitting, then put it in a ziplock baggie and squeeze all the air out.
This is typically referred to as "pickling an engine". Done when storing for 6+ months. Just to avoid having any oxidation/corrosion on the bare aluminum and bearings when it sits.