Genuine OEM Audi Oil Return Line, part number 03N145736D. This critical component is responsible for safely returning oil from the turbocharger or other engine systems back to the engine's sump, maintaining proper oil circulation and preventing oil starvation. Weighing approximately 0.52 kg and measuring 0.34 meters in length, it is designed for precise fitment. Using a genuine OEM oil line ensures correct routing, material integrity, and resistance to high temperatures and pressures, vital for engine longevity.