Genuine OEM Audi Oil Tracking Rod Tube O-Ring, part number 034115427B. This small, green O-ring is designed to provide a reliable seal for the oil tracking rod tube connection, preventing oil leaks and maintaining proper lubrication system integrity. Its specific material composition is chosen for resistance to engine oil and high temperatures. Using a genuine OEM O-ring ensures the correct material properties, precise dimensions, and long-term sealing performance, which is critical for preventing costly oil leaks and engine damage.