{"nhtsa_id":10056855,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2015-02-27","date":"2014-09-01","document_id":"WSB-35-4","mfr_campaign":null,"replaces":null,"component":"EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY","mfr_system":null,"summary":"WESTERN STAR: THE EXTERNAL BREATHER, ON FORWARD REAR DIFFERENTIAL CARRIER, HAS AN OIL LEAK AND A REMEDY FOR THE LEAK IS AN ADDITIONAL INTERNAL BREATHER, THAT IS AVAILABLE TO BE INSTALL. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10056855","components":[{"id":"equipment","name":"Equipment and accessories","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"WESTERN STAR","model":"4900","year_from":2009,"year_to":2009,"match":"exact","vehicle_ids":["2009_western-star_4900"]},{"make":"WESTERN STAR","model":"6900","year_from":2009,"year_to":2009,"match":"exact","vehicle_ids":["2009_western-star_6900"]},{"make":"WESTERN STAR","model":"CONSTELLATION","year_from":2009,"year_to":2009,"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":[]}