Why Do Aftermarket Headlights Turn Yellow?

[Jerry]

If the headlights replaced are not from the 4S store but are aftermarket ones, the lamp covers are made of recycled plastic. Initially, they may look almost the same as the original ones, but the specific reasons for yellowing are as follows: 1. Time Factor: Over time, the plastic lamp covers will turn yellow. 2. 4S Store: Although the original headlights replaced at the 4S store are more expensive, they use the exact same parts as those installed at the factory, ensuring quality and preventing yellowing. Additional Information: Not all replaced headlights will turn yellow, but those that do are definitely not original and are of inferior quality. Using a lower-wattage bulb can slow down the yellowing process, but plastic headlights on domestic cars will eventually turn yellow.