Thermostat, Wahler - E60, F10, E63, F13, E65, F02, X5/X6, M2/M3/M4

This is a direct replacement thermostat for the N62/N63/S63 turbo and non-turbo V8 used in 545i/550i, 645ci/650i, 745Li/750Li, X5, and X6. It's also used in the S55 turbo 6-cylinder used in the F87 M2 Competition, F80 M3, F82 M4, G87 M2, G80 M3, G82 M4.

Your engine's thermostat regulates coolant flow and temperature in the cooling system. When open it allows hot coolant to flow into the radiator to be cooled. When closed the coolant circulates through the engine, where it stays warm. A failed thermostat will either be open or closed with the engine running too cold (poor fuel economy and performance) or too hot (overheating). It can also impact your cabin heating/cooling since that system is drawn from your heater core. Modern cars are much more complex and have computer-controlled cooling strategies to regulate various temperature systems in the car, which makes the thermostat a more critical piece.

This is an OEM thermostat manufactured by Wahler - an original supplier to BMW for this part, as well as many other engine components. 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.