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      11-06-2012, 12:13 AM   #3
Private First Class

Drives: '11 e92 335i xDrive M-Sport
Join Date: Jan 2010
Location: Toronto

iTrader: (0)

Same thing happened on my 2011. Dealer gave me some 50/50 bmw coolant mix so I could top off when engine was cold, and was on my way. No issue since top up. I inquired about this as well, and I can't remember the exact wording, but something another the lines of the system having blow off if over-pressurized, so over time all of this blow-off may lead to the coolant level dropping. typically would happen a few months after the cap would have been removed and them replaced during service.