Genuine OEM Audi Valve Spring, part number 07L109623J. This component is a critical part of the engine's valvetrain system, providing the necessary force to close the intake and exhaust valves. It is located within the cylinder head assembly, working in conjunction with the camshaft and rocker arms. Proper functioning of the valve spring ensures the correct timing and sealing of the combustion chamber. Genuine OEM valve springs offer precise tension and durability for reliable engine performance.