Genuine OEM Citroen Engine Oil Pump Control Pinion, part number 9813634580. This essential gear is responsible for driving the engine oil pump, ensuring consistent oil circulation throughout the engine for lubrication and cooling. It is a precisely machined component, weighing approximately 0.078 kg, that engages with a chain to transmit power. Choosing a genuine OEM oil pump control pinion guarantees the correct tooth profile, material hardness, and dimensional accuracy for reliable operation and long service life, preventing premature wear and maintaining optimal engine oil pressure.