It improves overall engine efficiency, resulting in a more stable idle, better fuel efficiency, and reduced oil pollution. EGR Cooler Valve 2.0HDi 9807593080. It has a certain function of liquefying the oil vapor at the position of the exhaust gas circulation valve. After the oil vapor reaches the position of the circulation valve and hit the cooling valve body, it liquefies into oil and returns to the crankcase, which can effectively avoid excessive oil consumption problem. The function of the EGR valve is to control the flow of recirculated exhaust gases depending on the engine load., Manufacturer: hmeng