Its not a Dodge which practically come rusty from the factory. I have never heard of undercoating a BMW. My 2008 M5 which is driven heavily in winters has zero problems with rust or corrosion.
It would actually be a very bad idea as it would probably clog all the crazy drainage tunnels built into BMWs and cause a problem when there is none with it as is.
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2008 M5 6spd, 1995 540i 6spd
2018 M4 Vert Comp, 2019 i3 120ah REX
2021 X7 40i MSport, 2006 Z4M 6spd
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