the dealer cheaped out and used water in the system instead of washer fluid... and the 2 got mixed causing the fluid to lose it's freeze protection...
flush all the fluid out completely empty then use winter grade washer fluid to replace... I know it uses more than a gallon.. not sure exactly how much... I would buy 3 gallons just to be sure...
07 650i Cabrio CPO, Titanium Silver
Black Matte Grill
Dark Birch Wood Interior and Shifter
HUD, Cold Weather and Sports Package
Logic 7 Sound
Aluminum Racing Pedals
K&N Air Filters
Rays Master Piece REM 20" Forged wheels w/ Conti Extreme DWS