Genuine OEM BMW Crankcase Vent Tube, part number 11151705301. This component is responsible for routing crankcase gases away from the engine to ensure proper ventilation. Effective crankcase ventilation is crucial for engine longevity and performance by preventing pressure buildup and removing harmful contaminants. The tube is constructed from materials resistant to engine oil and heat. Genuine OEM parts guarantee the correct internal diameter and material properties for optimal and reliable crankcase gas management.