Genuine OEM Audi Oil Pump Chain Sprocket, part number 03F115121B. This sprocket drives the oil pump, which is crucial for circulating engine oil throughout the engine to ensure proper lubrication and cooling. It is located within the engine's oil pump assembly. Weighing approximately 0.159 kg with dimensions of 0.079m x 0.079m x 0.007m. Choosing a genuine OEM sprocket ensures precise tooth engagement and material durability, preventing premature wear and maintaining critical oil pressure for engine longevity.