Genuine OEM Audi Oil Pump Chain Tensioner, part number 045115124B. This component is crucial for maintaining the correct tension on the oil pump drive chain, ensuring consistent and reliable oil delivery throughout the engine. It is located within the engine's lubrication system. Constructed from durable metal with a low-friction plastic tensioning shoe, it is designed for long service life. Choosing a genuine OEM oil pump chain tensioner guarantees precise fitment, optimal chain engagement, and reliable oil pump operation, which is essential for engine longevity.