W 12, as the name implies, adopts W-type 12 cylinder engine, and the cylinders are arranged in W-type. On the basis of the V-shape, each group of cylinders is divided into two groups, arranged at a small angle. Seen from the side, the four groups of cylinders are arranged in a W shape. W-type engine is a unique technology of Volkswagen, and other Volkswagen brands such as Phaeton and Passat are also equipped with W-type engines. Cylinders are generally divided into in-line L-type, V-type, horizontally opposed B-type and W-type.