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My expansion tank is cracked and being repaired right now. Bigger issue is that all of the coolant leaked into the V between the cylinder banks and there was damage to the wiring. 46k miles on my 2020 M550i, so just prior to warranty running out. My suggestion is if you are having this issue to not ignore and fix asap to prevent more damage. I am sure anything related to wiring in this car will be expensive.
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