I live in Northern Wisconsin and we use snowmobile oil. Yamaha sleds are all 4 stroke now, and they have awesome low temp oils designed to resist corrosion. I don't know if they have short chain molecules designed for clutches, but due to the cold weather I prefer a winter oil over a thicker motorcycle oil. Amsoil also has low temp oil that works well. I've used both for years with NO adverse effects.
I do not believe any claim that an oil could prevent condensation (the science of it makes no sense), but you can use an oil that is designed to flow faster (reduce engine wear), start your engine easier, and reduce corrosion. Unfortunately that is what we live with up here, and you don't have to change your oil all the time if once a month you go riding for at least an hour. Go out and get that engine HOT so the moisture "cooks off".
Have fun, stay warm, and keep riding!