What does OES Genuine mean?

Answer 1

OES is Original equipment supplier. Equivalent to aftermarket parts. Companies that make auto parts that may or may not be a contracted supplier to the original car company. These parts are generally cheaper than original brand parts and subsequently can be of less quality, although that's not necessarily so. Most major car makers don't make their own parts, they contract them out to other companies. These OEM (Original equipment manufacturer) or OES companies make the parts that are branded with the original car makers logos and part numbers. They also may sell them as aftermarket parts and are thus labeled or branded as a generic OES.