11 15 7 503 523 : Crankcase breather hose to cylinder head cover for BMW Series 3 E46

This hose provides the connection between the oil breather and the cylinder head cover on the BMW Series 3 E46 fitted with N42 and N46 engines. It covers Saloon, Touring and Compact body styles in 316i, 316ti, 318i and 318ti versions, as well as Coupé and Cabriolet in 318 Ci version. As part of the restoration or maintenance of a classic vehicle, replacing this hose is essential to ensure proper crankcase ventilation and prevent any leaks or fouling. This new part restores the correct original operation of engine vacuum.