Genuine OEM Volkswagen Engine Valve Spring, part number 036109623R. This precision-engineered spring is crucial for the proper operation of the engine's valvetrain, ensuring that intake and exhaust valves close securely after opening. It is located within the cylinder head, acting on the engine valves. The spring is made from high-strength steel and features a specific coil design to maintain consistent tension. Genuine OEM valve springs provide the exact spring rate and fatigue resistance required for optimal engine performance and longevity, preventing valve float or premature wear.