Genuine OEM Audi Rocker Arm Shaft, part number 03G109365. This precision-machined shaft is an integral part of the engine's cylinder head assembly, serving as a support and pivot for the rocker arms. It is essential for the proper functioning of the valve train, enabling the precise opening and closing of engine valves. Positioned within the cylinder head, it works in conjunction with the camshafts. Weighing 0.251 kg and measuring 0.424 m in length, this shaft is built to exacting standards. Installing a genuine OEM rocker arm shaft ensures optimal fit, durability, and the critical alignment needed for consistent valve timing and peak engine performance.