West Norway is really some next-level stuff when it comes to rust. I guarantee that things are a lot worse than Minnesota and Canada. Other car manufacturers send their cars here to test for rustproofness, and if they survive for two or three winters, it is a very good sign of quality. It's not just that roads are actively salted for 5 months of the year, it's also that things are constantly wet due to massive amounts of rain. And the rain doesn't come straight down, it's mostly horizontal due to the wind. So it's not just salt water spray when you're driving, all parts of the car are more or less continuously drenched in salt water for months at a time. I'm exaggerating slightly here, but I'm just trying to underscore that Bergen is not Minnesota. You haven't seen bad weather before you've tried a fall and winter over here.
I know that aluminium is much more corrosion-resistant than steel, but there are things that happen with aluminium structures when exposed to highly ionic environments (salt). So this is definitely something worth to keep an eye on. It is possible to rust-proof cars, but if done in retrospect this could require sand-blowing first, which is expensive.