Is your BMW's coolant level dropping, or do you see cracks or leaks in the plastic expansion tank? This MTC replacement tank is a direct-fit part for BMW models that use the OEM part number 17-11-7-573-781. The expansion tank (or coolant reservoir) is a crucial part of the cooling system, holding excess coolant and allowing for expansion as the engine heats up. Over time, the plastic can get brittle and fail. Replacing a leaking tank is important to prevent overheating. This is an aftermarket part manufactured to meet specifications. As always, it's super important to double-check that this part number matches the one on your old tank or is listed for your specific BMW model, year, and engine before you order. A straightforward swap that can save your engine from serious damage.
