Genuine OEM Volkswagen Oil Pump Drive Chain Tensioner, part number 077115124A. This critical engine component is responsible for maintaining the correct tension on the oil pump drive chain, ensuring consistent and reliable oil delivery throughout the engine. Constructed from durable black plastic with a metal spring clip, it weighs approximately 0.08 kg. Using a genuine OEM tensioner guarantees precise fitment and the correct spring force, preventing chain slack that could lead to oil pump malfunction and severe engine damage.