Senang crita OEM got 2 types. 1 murah 1 expensive.
Example. Spark plugs, ngk n denso, it's good and recognize brand, quality also tahan. And it's oem. Then u will see Honda Toyota Perodua plug as well. They call it Ori, but Honda Toyota never made plug, so they ask denso n ngk made for them. Ngk denso is high quality oem. Then u may find other brand in shopi, brand u never heard b4, tats cheap oem.