Genuine OEM Mini Oil Pump Chain, part number 11418631843. This chain is a critical component that drives the engine's oil pump, ensuring consistent lubrication of engine components. It is located within the engine's timing system. The chain is constructed from high-strength metal links designed for durability and precise operation. Genuine OEM oil pump chains are manufactured to exact tolerances for length and tensile strength, guaranteeing reliable oil circulation and protecting the engine from wear.