Genuine OEM Audi Engine Rocker Arm Shaft, part number 038109527AF. This precision-engineered component supports and provides the pivot points for the engine's rocker arms, facilitating accurate valve actuation. It is located within the cylinder head, integral to the valvetrain assembly. Weighing approximately 2 kg, this shaft measures 0.28m in length. Using a genuine OEM rocker arm shaft ensures correct material hardness, dimensional accuracy, and smooth operation, preventing premature wear and maintaining optimal engine performance.