What is the difference between aftermarket and OEM parts?

[AmirRose]

The difference between aftermarket and OEM parts mainly lies in their definitions. OEM parts generally refer to components assembled by the automobile manufacturer's designated suppliers. If other manufacturers outside the designated suppliers or dealerships produce parts for the same vehicle model, these can be considered as aftermarket parts. Methods to distinguish between OEM and aftermarket parts are as follows: 1. OEM parts: These come through the manufacturer's official channels, bear the manufacturer's logo, and are mainly sourced from the automaker and authorized 4S stores. They come in packaging with the brand's logo, are generally more expensive, but offer guaranteed quality. 2. Aftermarket parts: These are usually produced by various brands of different sizes, with quality that cannot be guaranteed and tends to be inconsistent.