How to Distinguish Between OEM and Aftermarket Car Doors?
2 Answers
OEM and aftermarket car doors can be distinguished through the following methods: 1. Identify by the door's stamped markings: OEM doors have stamped markings, although their positions may vary. As long as you find stamped markings on the door, it is an OEM door. 2. Differentiate by the door's welding process: OEM doors are machine-welded, with uniform and smooth weld points, and the welding positions are relatively fixed. 3. Distinguish by the door's sealing adhesive: During production, car doors are automatically sealed with adhesive, and the position and amount of adhesive are relatively fixed. 4. Compare by the door's weight and material: OEM doors have better material, thickness, and weight than aftermarket doors. You can distinguish them by comparing the door's weight, thickness, and the sound when tapped.
I always think that when buying second-hand car doors, you have to pay attention to differences in quality and workmanship. Original equipment manufacturer (OEM) doors are usually made directly by the car manufacturer, so the fit and materials are particularly good; while aftermarket ones might have larger gaps, a duller sound when closing, and feel lighter. I once got tricked when replacing a door—the aftermarket one had uneven paint and even peeled in the summer. Look at the edge seals: OEM ones are usually tight and don’t loosen, while aftermarket ones might reveal flaws if you pull on them. As for weight, if you weigh them, OEM doors are heavier due to better alloy materials, while aftermarket ones use thinner materials to save costs, making them less safe in collisions. I suggest bringing a magnet—OEM doors often use more metal and have stronger magnetism, while aftermarket ones have more plastic and won’t stick well. Also, check the screw hole positions: OEM ones are precise with no deviation, but aftermarket ones might cause the door to not close properly after installation, requiring rework. In short, paying attention to these details can save you money and ensure safety.
