The Genuine VW / Audi Turbocharger Oil Line O-Ring (part number WHT001965) is a small rubber ring used to seal the connection between the turbocharger oil line and the engine. This o-ring is specifically designed for use in Volkswagen and Audi vehicles and is made from high-quality materials to ensure a secure and leak-free seal. It is an essential component for maintaining proper lubrication and performance of the turbocharger system.