Genuine OEM Volkswagen Oil Pump Chain Tensioner, part number 03E109507AA. This essential engine component is responsible for maintaining the correct tension on the oil pump chain, which drives the oil pump to circulate engine oil. Proper tension prevents chain slack, ensuring consistent oil pressure and preventing premature wear. Weighing approximately 0.093 kg, this tensioner is manufactured in Germany to precise specifications. Using a genuine OEM chain tensioner guarantees the correct spring rate and material quality, crucial for the longevity and reliable operation of the engine's lubrication system.