Chiming in from the Midwest USA: cars manufactured with galvanized (https://en.wikipedia.org/wiki/Galvanization https://en.wikipedia.org/wiki/Galvanization) met

Chiming in from the Midwest USA: cars manufactured with galvanized (https://en.wikipedia.org/wiki/Galvanization https://en.wikipedia.org/wiki/Galvanization) metal seem to fair better in my experience. That said, galvanization isn't terribly common and as you mentioned, if you really care about your car you should store it in the winter.