Genuine OEM Audi Turbocharger Oil Return Line, part number 04L145736E. This critical component is designed to efficiently return hot oil from the turbocharger back to the engine's lubrication system, preventing oil starvation and overheating. Its robust metal construction, featuring corrugated sections, allows for thermal expansion and vibration absorption. Choosing a genuine OEM oil return line ensures correct routing geometry, material integrity, and leak-free operation, vital for the longevity and performance of your turbocharger and engine.