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You don't *need* to do anything else. Winter tires and a good wash every so often to get rid of salt is how I've gotten through midwest winters. There is nothing special about the car and like many many other cars it's tested during design in harsh weather environments.
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2019 G30 M550i
GBNF:
2021 G80 M3, 2019 F90 M5 Competition, 2016 F80 M3, 2014 F22 M235i
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