Thermostat, Wahler - E46, E39, X3, X5, Z3, Z4 (11537509227)

This Thermostat is a replacement OEM temperature thermostat for your cooling system. A healthy thermostat is critical to the long-term performance and durability of your engine. Luckily thermostats typically fail in the open position - allowing coolant to flow through the radiator - and not in the closed position which can lead to overheating. If your E46, E39, X3, X5, Z3, or Z4 temp gauge reads cold (lower than normal) it's probably due to a thermostat that is stuck open. Overheating can have many causes but a thermostat stuck closed is possible but unlikely.

This is an OEM M52TU/M54 thermostat manufactured by Wahler - the original supplier to BMW for this part. As the OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

Supersedes BMW Part # 11530139877 (11-53-0-139-877).