Precision-forged billet steel crankshaft engineered for BMW M57 diesel engines (D25/D30). CNC-machined to exact OEM tolerances with micro-polished journals for reduced friction. Direct replacement for E36/E60/E61/E63/E83/E90/E91 models. Shot-peened surface enhances fatigue resistance under high torque loads. Includes all necessary balance weights and oil passages. Ideal for performance rebuilds or OEM-spec repairs. Ships in protective anti-rust coating with installation alignment marks.