11 15 7 503 523 : Oil breather hose for BMW Series 3 E90 E91 E92 E93

This oil breather hose ensures the connection between the cylinder head cover and the oil separator on the BMW Series 3, in its saloon (E90), touring (E91), coupé (E92) and cabriolet (E93) body styles. It plays an essential role in managing oil vapours from the crankcase ventilation circuit, and replacement is essential as soon as leaks or hose deterioration appear. As part of the restoration or maintenance of a classic BMW Series 3, choosing a new original part guarantees proper circuit operation and preserves engine integrity.