Genuine OEM Audi Turbo Oil Return Line, part number 03F145735C. This critical component is responsible for carrying hot oil away from the turbocharger, returning it to the engine's oil pan. It ensures proper lubrication and cooling of the turbo, preventing overheating and premature wear. The line is a bent metal pipe, weighing approximately 0.061 kg. Using a genuine OEM oil return line guarantees the correct routing geometry, material integrity, and sealing properties required for high-temperature, high-pressure turbocharger operation, preventing leaks and ensuring long-term reliability.