Built to original equipment form, fit and function, the BMW Genuine Coolant Expansion Tank covers BMW X3 2.0L Turbo Diesel AWD models built from 2016 to 2022. The Plastic construction resists coolant additives, heat cycling and pressure fatigue. Hose is moulded to the factory shape with the correct bends, clip locations and internal diameter. Replace the cap, thermostat and hoses together on high-kilometre vehicles - they are cheap compared with a head gasket. Pressure rating is 80kPa; running the wrong rating will either boil the coolant or stress the radiator seams. Opening temperature is 85 degrees Celsius, matching the engine management calibration. Supplied new and backed by a 12 Months warranty.