Genuine OEM Audi Valve Spring, part number 06F109623J. This valve spring is a crucial component within the engine's cylinder head, working in conjunction with the camshaft and valves to ensure proper engine breathing. It provides the necessary force to close the valves quickly and reliably. Manufactured from high-strength, heat-treated steel to maintain consistent tension and durability under extreme operating conditions. Genuine OEM valve springs are precision-engineered for exact spring rates and fatigue resistance, ensuring optimal valve train function and engine longevity.