It is quite obvious the joint between the tank and hose is leaking, right? Coolant zip through thr joint, flow down and caught at the lip, dry to the white residue. I wonder if there is white residue below the expansion tank? Kind of indicates how much the leak is. But either way, if car is under warranty, have dealer tske a look.
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2022 G05 B58/PHEV
+ a few very old BMWs
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