Genuine OEM Volkswagen Engine Valve Spring, part number 06E109623AD. This essential engine component is responsible for returning the engine valves to their closed position after they have been actuated by the camshaft. It is located within the cylinder head, compressing and expanding with each valve cycle. Weighing 0.034 kg, this spring is manufactured from high-grade spring steel to maintain consistent tension under extreme engine temperatures and high cycle counts. Using a genuine OEM valve spring ensures correct valve seating and prevents valve float, which is crucial for optimal engine performance and preventing catastrophic engine damage.