Genuine OEM Audi Oil Return Line Pipe, part number 06D145735B. This pipe is responsible for safely returning oil from a component, such as a turbocharger, back to the engine's oil reservoir. It is a rigid metal pipe, approximately 0.33 meters in length, designed for high-temperature and pressure environments. Using a genuine OEM oil return line ensures precise fitment, correct material composition, and leak-free operation, critical for engine longevity.