{"nhtsa_id":10203304,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-11-08","date":"2021-06-07","document_id":"TSB210118","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"This Technical Service Bulletin describes the verification and resolution of excessive oil carryover out of the crankcase breather tube due to he rocker lever cover connection port for the crankcase breather air supply line and the air supply to the oil separator jet pump being restricted.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203304-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203304-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10203304","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"X12","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":[]}