Briefing: this article would show you the exact meaning when your dealers tell you the parts they sell are original, OEM, or copies. And, of course, no one would say they sell fake parts, but fake parts exist, and a lot.
If DENSO delivers 100 injectors (certain model) to SINOTRUK, and SINOTRUK may take 40 of them to install on new trucks, and the rest 60 are sold to wholesalers, in this condition, the injector is genuine original.
The quality of original parts are guaranteed, but the only problem is, price is high, for most items, original parts are 25% more than OEM parts, and some items are ridiculously high, even tripled.
With your understanding of original parts, OEM is easy to know.
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