I bought my 2017 M240i CPO about 4 months ago, production date 1-9-17. 29,000 miles on it now. After reading about this I checked my coolant levels and sure enough, both reservoirs were below minimum. No warning from the iDrive at all, it took about 8 oz's to fill both to max. Now it's something I'll be keeping an eye on. Odd that these weren't topped off at the dealership as part of the CPO checklist. I seriously doubt it's ingested 8 oz's of coolant in the 2k miles I've driven it.
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