Genuine OEM Audi Engine Chain Tensioner Seal, part number 06M109139B. This critical seal is designed to prevent oil leaks from the engine's chain tensioner assembly, ensuring proper lubrication and pressure within the engine. It forms a tight barrier against oil seepage. Weighing a mere 0.0005 kg, its precise dimensions are vital for effective sealing. Choosing a genuine OEM seal guarantees the correct material composition and dimensional accuracy, which are essential for long-term oil containment and engine health.