It can keep the temperature of the car before it reaches the normal temperature. The water of this engine can only circulate in the upper part of the water tank. It is a so-called small cycle, which makes the engine heat up quickly because it is at a low temperature. It is very fuel-intensive and the most damage to the car, which will bring a series of problems of carbon deposition, and then it can be opened after exceeding the normal temperature, allowing the water to circulate in the entire water tank for rapid heat dissipation. •It's very easy to install and remove •Made of plastic and copper, hard and durable to use •Providing excellent performance and lifespan Note: •Please check the OE number before placing an order. Specification: •OE number: 17111437362 •Net weight: 0.09kg •Material: plastic+copper •Applicable model: E46, E53, E83, E85, E86, X3 Package included: •1 x Car Oil Cooler Radiator Thermosistor