Genuine OEM Volkswagen Crankshaft, part number 04L105021A. This is the main rotating shaft within the engine, responsible for converting the reciprocating motion of the pistons into rotational torque that powers the vehicle. It is a core component of the engine's internal rotating assembly. This crankshaft weighs 13.81 kg. Genuine OEM crankshafts are precision-balanced and manufactured to exact tolerances to ensure smooth operation, durability under high stress, and optimal engine performance.