Genuine OEM Audi Turbocharger Oil Return Line, part number 03C145735F. This pipe is crucial for returning hot oil from the turbocharger back to the engine's oil pan, preventing oil starvation and overheating of the turbo. It is positioned to connect the turbocharger's oil outlet to the engine block. Constructed from durable metal with a flexible braided section to accommodate engine movement and vibrations. Choosing a genuine OEM part ensures precise fitment, correct routing geometry, and material integrity for long-term turbocharger health.