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      01-15-2020, 03:39 PM   #17
ACF90M5
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Drives: 2018 F90 M5
Join Date: Aug 2018
Location: CT

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I've had it multiple times. I had an unknown leak back in August that looked like oil. Been running through coolant like crazy and just got told a rock punctured one of my auxiliary radiators after they pressure tested it. When you bring it in for a top off and they don't put in a crazy amount to either reservoir you should be fine. Otherwise it is something you should look into asap
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2018 BMW M5 Black Sapphire Metallic
GONE - 2013 Audi S6 Phantom Black Pearl
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