Vehicle Fitment - Compatible for BMW 530i 2017 ( Base 2.0L L4 - Gas ), for BMW 535i 2011-2016 ( Base 3.0L L6 - Gas ), for BMW 535i GT 2010-2017 ( Base 3.0L L6 - Gas ), for BMW 535i GT xDrive 2011-2017 ( Base 3.0L L6 - Gas ), for BMW 535i xDrive 2011-2016 ( Base 3.0L L6 - Gas ), for BMW 540i 2017 ( Base 3.0L L6 - Gas ), for BMW 640i xDrive 2014-2017 ( Base 3.0L L6 - Gas ), for BMW 640i xDrive Gran Coupe 2014-2017 ( Base 3.0L L6 - Gas ), for BMW 740i 2013-2015 ( Base 3.0L L6 - Gas ), for BMW ActiveHybrid 5 2012-2016 ( Base 3.0L L6 - Electric/Gas, 3.0L L6 - FULL HYBRID EV-GAS (FHEV) ) [REPLACE PART NO.] 11538671516. Prior to buying, please verify the make, model, and year of your vehicle. Function - The role of the engine thermostat is to regulates the flow of the coolant going through the radiator to keep the engine stay in stable operating temperature levels. This thermostat housing assembly is designed to match the function and form of the original one, exactly OEM design to replace your old worn parts, it can withstand extreme temperature changes, durable, high hardness, not easy to deform, ensure your vehicle performs with optimum levels of safety. Directly Fit - OE replacement Engine Coolant Thermostat Housing Assembly, easy to fit. Easy to install with simple tools in just minutes. No special tools are required for installation. Purchase with assurance - 365 Days of Unrestricted Mileage GuaranteeWe work hard to give you a positive shopping experience because we genuinely care about your satisfaction. Please don't hesitate to contact us with any more questions. Function: Replacement for an original engine coolant thermostat housing that has failed as a result of fatigue and heat. Our product is made of high quality plastic & metal material, manufactured according to production standards, durable, high hardness, not easy to deform, withstand extreme temperature changes and resist cracking and leaking, make sure the engine operates within a reasonable temperature range and that ensure your vehicle performs with optimum levels of safety.