Genuine OEM Audi Turbocharger Oil Return Line, part number 03L145736F. This essential component is responsible for returning hot oil from the turbocharger back to the engine's oil pan, ensuring proper lubrication and cooling of the turbo. It is positioned at the bottom of the turbocharger assembly. Constructed from durable metal, this line measures approximately 0.235 meters in length and weighs 0.152 kg. Using a genuine OEM oil return line guarantees the correct material resistance to high temperatures and oil, precise bends for proper routing, and leak-free connections, which are vital for turbocharger health.