Genuine OEM Volkswagen Engine Valve Spring, part number 06M109623E. This crucial component is responsible for closing the engine valves after they are opened by the camshaft, maintaining proper valve train operation. It is located within the cylinder head assembly, above the engine valve. Weighing 0.034 kg and measuring 0.048m in length, this spring is engineered for precise tension. Using a genuine OEM valve spring ensures correct spring rate and fatigue resistance, critical for maintaining optimal engine performance and preventing catastrophic valve train failure.