What is ORIGINAL EQUIPMENT MANUFACTURER (OEM)?

ORIGINAL EQUIPMENT MANUFACTURER (OEM) — refers to the manufacturers of complete vehicles or heavy­duty engines, as contrasted with remanufacturers, converters, retrofitters, up-fitters, and repowering or rebuilding contractors who are overhauling engines, adapting or converting vehicles or engines obtained from the OEMs, or exchanging or rebuilding engines in existing vehicles.