{"nhtsa_id":10150094,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-12-03","date":"2013-03-01","document_id":"110308","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"Crankcase Ventilation System Diagnosis and Measurement. INFORMATION All current BMW engines incorporate a pressure-controlled crankcase ventilation system. The crankcase ventilation systems use various different crankcase ventilation valves, depending on the engine type. Although the valves all look different, they function similarly, using a spring and diaphragm assembly to control the crankcase pressure. A properly functioning pressure control valve is designed to maintain a slight vacuum (underpressure) in the crankcase, which assures reliable crankcase venting during all engine operating conditions. Some of the causes and results of a malfunctioning crankcase ventilation system are listed below.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10150094-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10150094-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10150094","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BMW","model":"BMW","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}