{"nhtsa_id":10174787,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-05-08","date":"2020-04-24","document_id":"M011647300","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; EQUIPMENT","mfr_system":null,"summary":"The new cylinder head gasket has a funnel seal that diverts oil from the cylinder head back into the oil drain passage in the block. This oil diversion prevents oil from collecting between the cylinder block and the shim gasket.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10174787-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10174787-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10174787","components":[{"id":"engine","name":"Engine","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CATERPILLAR","model":"C15","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CATERPILLAR","model":"C18","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":[]}