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Sorry for the troubles.
I had a 2016 M4 F83. Drove it through ONE extremely crazy winter storm -- got caught on the mountains in NorCal / Oregon border. Lots of reddish colored volcanic rock / gravel / sand / salt. Drove through. A few days later came back through and the roads were very gritty. The next wash I noticed the entire side, front / rear fenders / rear bumper / etc -- all thrashed just as badly as yours.
It was extremely disappointing. In my case behind the wheels was chewed up from larger gravel in addition to just the minor dints/nicks ... I sold the M4.
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