Genuine OEM Audi Lower Timing Chain Guide Rail, part number 079109513C. This component is essential for guiding the engine's timing chain, ensuring proper tension and alignment to maintain accurate valve timing. It is specifically designed as the lower guide rail within the timing chain assembly. Manufactured from durable, low-friction composite material, it provides smooth operation and wear resistance. Choosing genuine OEM ensures the correct dimensions, material composition, and mounting points for reliable engine timing and longevity.