Genuine OEM BMW Crankcase Ventilation Pipe, part number 11158608766. This pipe is responsible for routing gases from the engine's crankcase to the intake system for proper ventilation and emissions control. It connects various components within the crankcase ventilation system. Made from materials resistant to oil and heat, ensuring durability. Genuine OEM parts are crucial for maintaining the precise flow and pressure characteristics required for effective crankcase ventilation.