Make sure you service system at Mercedes-Benz with installed 2.0 engine correctly. You may use code of motor M266.980 and volume figure of 2.0 or just tell the 2007 year of production to buy liquid. There is no chance 2011 B-Class engine will work efficiently with bad cooling. For filling up the system you will use 0-0 liters of special Green coolant type. There are some conditions in servicing cooling module at Mercedes-Benz B-Class.
Providing you keep the rules 1.7 motor installed in B-Class of 2009 year will be long lasting. There is a big plus in servicing 2011 Mercedes-Benz B-Class with all regulations. Better buy 5 liters of good antifreeze in Green color. It’s obvious that every M266.940 motor needs good service as stated by Mercedes-Benz in instruction.