The Genuine BMW Air Duct Oil Cooler Left (part number 51747260405) is a component used in BMW vehicles to help cool the engine oil. It is located on the left side of the vehicle and is responsible for directing air flow to the oil cooler. This air duct is a genuine BMW product, ensuring high quality and compatibility with the vehicle. It is designed to fit and function just like the original part, providing optimal performance and efficiency. This air duct is an essential part of the vehicle's cooling system and is crucial for maintaining the proper temperature of the engine oil.