Safelite manufactures its own windshields, but they are not considered original equipment manufacturers (OEMs). This means that they do not have legal permission to manufacture windshields to the exact specifications of the original (thickness, contour, shade, etc.). OEM stands for Original Equipment Manufacturer. OEM Auto glass is manufactured by the same manufacturer that provided the original glass that the automaker placed in your vehicle.
In essence, you should get a windshield almost identical to the factory glass that came with your vehicle when it came off the assembly line. OEM glass also has a special brand of car manufacturer. Even those who buy OEM endorsements have to read the fine print of their contract because automotive glass isn't always included. When your windshield cracks and needs replacement, there are two types of windshield glass available to you: OEM and aftermarket glass.
Conversely, if another company also operates that same part to sell to automotive glass wholesalers and replacement stores, that part (no matter how well manufactured) is not an OEM part. Undoubtedly, your customers will take the information you provide them with regard to OEM and OEE automotive glass very seriously. However, if you want to go for something more affordable, then recommend OEE glass, since its price is significantly lower than that of OEM glass. OEM glass must be used to replace windshield glass because of the complex technology now available in vehicles, especially in the windshield, Nissan says.