BMW Engine Coolant Expansion Tank - Mahle 17137501959 X5

MFG Numbers 996274

Vent screw and level switch pre-installed

The expansion tank on your X5 endures thousands of heating a cooling cycles through it's service life. In addition, it also sees severe heat changes as coolant cools and heats up. This can cause small hair line cracks or other component failures. We highly encourage replacing your expansion tank at the same time when replacing your radiator for best long term cooling system reliability.