Genuine OEM Volkswagen Turbocharger Oil Return Line, part number 03L145735F. This line is responsible for returning lubricating oil from the turbocharger assembly back to the engine's oil sump. Proper oil return is crucial for preventing oil buildup in the turbocharger and ensuring its continued lubrication and cooling. Features a flexible hose section and metal piping for optimal routing. Genuine OEM ensures correct flow rates and material resistance to heat and oil.