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Restarting this thread on behalf of my 2017 440i GC with 29K miles.
The reservoir cap was replaced in September 2019 after low coolant warning appeared. I added a liter of proper 50/50 mixture before driving to the dealer. The dealer pressure tested the coolant system and found no leaks.
I checked the main coolant tank again. The coolant is a bit low but not low enough to trigger a warning message. White residue around the cap has resurfaced.
The smaller tank (intercooler) is full.
Will be bringing the car to the dealer on Monday for an oil change and pre-warranty expiration check.
Any insights from other forum members, especially about coolant leaking through the turbo bearing?
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