{"nhtsa_id":10001245,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2003-04-25","date":"2003-03-01","document_id":"030601008","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"CRANKSHAFT REAR OIL SEAL LEAKS DURING EXTREME COLD WEATHER OPERATION. ON CERTAIN MODELS INCLUDING THE CHEVROLET AND GMC C4500/C5500 MODELS. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10001245","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"C/K SERIES","year_from":2002,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"C4500","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"C/K SERIES","year_from":2002,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"C4500","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":[]}