BMW Genuine Radiator Expansion Tank

• By using Genuine BMW Parts, you can be assured that your vehicle will be restored to the same exacting standards as originaland a perfect fit every time.
• Original BMW Radiators must pass grueling test series under extreme conditions - in summer and in winter - in order to reliably guarantee a high level of performance.
• Theyare exactly matched to the BMW engine and vehicle characteristics and correspondingly dimensioned and designed.
• Only this matching can guarantee a positive influence on the acoustics, the CW value, the engine compartment air flow (temperature in the engine compartment) and the climate performance.
• Component damage due to excessive temperatures is eliminated, increased wear is prevented.
• Fuel consumption is also significantly reduced since the engine is kept at the optimal temperature. Only applies to transmission oil air cooling.

Represented by part number 12 in the diagram.