To be fair to the oriental makes (to a degree - they should've noticed by now and changed their designs/manufacturing processes to suit), they probably see this as less of a problem as their home markets don't see much in the way of snow (and therefore roads get salted far less, if at all - a major contrinutor to cars rusting in colder climes if they aren't regularly cleaned).
Its also quite well known that for years, many Japanese brands designed their cars to last (without serious issue structurally) only 7 years, the MX-5 being the most famous example. I wonder if that still continues, and perhaps is the main reason (other than their home climate) why some makes still scrimp on the weather/rust-proofing...
That being said, a large part of their sales ARE in colder climes and so they should have done something about it by now. My 12 Mazda3 is fairing reasonably well - a few spots here and there, but then it is a 12yo car (even if its only done 65k miles - its never been garaged). I note that other than Mazda (unsurprisingly) being mentioned, Honda hasn't.
One of the few things EU brands seem to have got (for the most part) right in terms of engineering quality, and perhaps something the oriental brands can learn from them.
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