Crankcase Vent Hose - E82 135i, E9X 335i, E60 535i N54

This hose runs from the valve cover to the intake manifold on the N54 engines - E82 135i, E90/E92/E93 335i/335xi, and E60 535i/535xi. It's part of the crankcase vent system (CVV) and carries oil vapor out of the valve cover and into the intake duct at the back of the manifold. Because of the plastic connections, it's very prone to cracking and failure and oil leaking into the engine compartment.

This is the Genuine BMW N54 crankcase vent hose.