Shop OEM BMW Part # 17137601948 (17-13-7-601-948, 17137575577). Engine Coolant Reservoir. 4.4 LITER TURBO (N63T), MAIN. 4.4 LITER TURBO, MAIN, 2009-12. 4.4 LITER, MAIN. 4.4 LITER, MAIN, 2010-12. 550i GT

Engine Coolant Reservoir. Expansion tank.
A container that holds Engine Coolant.

Engine Coolant Reservoir

4.4 LITER TURBO (N63T), MAIN. 4.4 LITER TURBO, MAIN, 2009-12. 4.4 LITER, MAIN. 4.4 LITER, MAIN, 2010-12. 550i GT. 550i, 550xi. 650i, 650i xDrive; w/o Gran Coupe. 750i, 750Li. 750i, 750Li, 750Xi, 750Lxi. W/O M6, MAIN.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.