This product is a genuine VW / Audi turbocharger oil line O-ring with the part number N90715601. It is used to seal the connection between the turbocharger and the oil line, preventing oil leaks and ensuring proper functioning of the turbocharger system. This O-ring is specifically designed for use in VW and Audi vehicles and is made with high-quality materials to ensure durability and reliability. It is an essential component for maintaining the performance and efficiency of the turbocharger system in these vehicles.