The Genuine BMW Air Duct Displ. Engine Oil Cooler Left - 51747308827 is a component of the engine cooling system for BMW vehicles. It is designed to direct air flow to the engine oil cooler, which helps to regulate the temperature of the engine oil and maintain optimal performance. This air duct is specifically designed for the left side of the vehicle and is made from high-quality materials to ensure durability and reliability. It is an authentic BMW product and is essential for proper engine functioning.