{"nhtsa_id":634683,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-10-04","date":"2002-08-01","document_id":"020601028","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:GASOLINE","mfr_system":null,"summary":"INFORMATION REGARDING ENGINE CRANKCASE FLUSH FOR 2003 AND PRIOR GM CARS AND TRUCKS AND ISUZU LIGHT AND MEDIUM DUTY TRUCKS WITH GASOLINE ENGINES. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/634683","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"AM GENERAL","model":"HUMMER","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"BUICK","model":"BUICK","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"CADILLAC","model":"CADILLAC","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"CHEVROLET","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"GMC TRUCK","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"ISUZU","model":"ISUZU TRUCK","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"OLDSMOBILE","model":"OLDSMOBILE","year_from":2003,"year_to":2003,"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":[]}