now thats just funny. you sure if was motor oil? Motor oil has a far stronger base to neutralise acids than any circulating oil.However to strong an alkali will also create corrosion so its not a good idea to submerge a metal part in such a strong alkaline medium for long.All thats needed is run the oil through the engine till it comes out of the exhaust, wrap in newspaper and pack away in a box. One molecule layer is sufficient.Besides, whos to say the engine did not have corrosion before he submerged it?