Genuine OEM Audi Oil Cooler Line, part number 420115689T. This line is responsible for transporting oil to and from the oil cooler, playing a critical role in maintaining optimal engine oil temperature. It features a combination of rigid metal piping and a flexible braided section to accommodate engine movement and vibration. Weighing 1.306 kg and measuring over a meter in length, it is a substantial component. Using a genuine OEM oil cooler line ensures correct routing geometry, pressure resistance, and material compatibility, preventing leaks and maintaining efficient oil cooling.