Genuine OEM Audi Oil Return Line, part number 03L145735B. This critical component facilitates the return of lubricating oil from the turbocharger back to the engine's oil pan, ensuring proper oil circulation and preventing oil starvation or buildup in the turbo. Weighing 0.321 kg, this genuine OEM line provides precise routing and material resistance to high temperatures and oil pressure, crucial for the longevity of the turbocharger and engine.