I noticed a puddle of coolant under my 2018 440i recently. Expansion tanks were low. Took to dealer. Dealer reported a rock had damaged my intercooler radiator (as we've seen reported on forums many times) BUT because of a recent Service Bulletin, BMW is covering the repair under warranty. BMW added a "rock guard" (p/n 17118485042) at a certain point in production after my car was produced 8/17. So the intercooler was replaced and a rock guard installed. I don't know if BMW will cover rock damaged to radiators if your car already has this rock guard. The intercooler is at the lowest point, clearly visible through the wide open center mouth of the M Sport front facia.
See photo with rock guard installed.
John
BMWCCA 6428
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