What is the difference between OEM glass and aftermarket glass?
2 Answers
OEM glass and aftermarket glass differ in terms of designated suppliers and part numbers. OEM glass is supplied by manufacturers designated by the carmaker, while aftermarket glass is not. Aftermarket glass mainly comes from various small parts factories and refurbishment plants in towns and villages. OEM glass has the same part number format and digits as the original car glass, whereas aftermarket glass may have different digits and markings. Automotive glass: It is an essential component of vehicle body accessories, primarily serving a protective function. Automotive glass is manufactured by heating the glass to near its softening temperature in a heating furnace, then quickly transferring it to cooling zones with varying intensities for uneven cooling. This process creates different stress levels between the main viewing area and the peripheral areas of the glass. Generally, this method produces zone-tempered glass. Main classifications: Automotive glass can be divided into three main categories: laminated glass, tempered glass, and zone-tempered glass, all of which can withstand strong impacts. Based on their location on the vehicle, they are classified into four types: windshield glass, side window glass, rear window glass, and sunroof glass. National regulations mandate that windshields must be made of laminated glass, side windows use tempered glass, and rear windows typically use tempered glass with electric heating wires.
I've worked in an auto repair shop for many years, frequently helping customers replace windshields. OEM (Original Equipment Manufacturer) glass is officially supplied by the car brand, made with high-quality materials and installed with precision, resulting in low wind noise and excellent sealing—no leaks during rain. Aftermarket glass is produced by third-party manufacturers and may be significantly cheaper, but the fit can sometimes be subpar—common issues include large gaps leading to wind leaks or unusual noises after installation. In terms of safety, OEM glass undergoes rigorous impact testing, shattering into small, harmless pieces; aftermarket quality varies widely, and inferior products may break into large, dangerous shards during collisions, endangering passengers. I recommend getting it installed at an authorized shop—don’t cut corners to save money and take unnecessary risks. Long-term use of OEM glass is more hassle-free and comes with a multi-year warranty, making the extra cost worthwhile to avoid the hassle of repeated repairs.
