Genuine BMW Crankcase Breather Hose - 11157567802 - This genuine BMW crankcase breather hose is designed to replace the factory breather hose and keep your BMW's engine running smoothly. Constructed from high-quality materials, this hose is designed to provide a tight seal and prevent oil and coolant leaks. It is a direct replacement for the OEM breather hose and is backed by a 2-year warranty.