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OEM (original equipment manufacturer) is a broad term whose meaning has evolved over time. In the past, OEM referred to the company that originally built a given product, which was then sold to other companies to rebrand and resell.
The term OEM stands for Original Equipment Manufacturer. What does that really mean? It means that the part was made by a company that is a subcontractor to a vehicle manufacturer. It DOES NOT mean the part was made by the manufacturer. Some examples; Most fuel parts on a VW are made by Bosch. This means that Bosch is the OEM for VW regardless of where you buy the Bosch part it is still OEM.