Description: Genuine BMW OEM BMW models BMW M3 (F80) with the S55 3.0L engine BMW M4 (F82, F83) with the S55 3.0L engine BMW M2 Competition (F87) with the S55 3.0L engine The valve spring is a crucial component in the engine’s valve train. It ensures that the valves return to their closed position after being opened by the camshaft, maintaining proper engine timing and performance.