What do OEM, OEE and aftermarket mean?
The labels describe who made the glass and whose name is on it, not whether it's legal or safe. All three must meet the same federal safety standard.
| Term | What it means | Typical cost |
|---|---|---|
| OEM (original equipment manufacturer) | Made for the automaker and carries the automaker's logo, like the glass your car left the factory with | Highest |
| OEE (original equipment equivalent) | Made by a glass manufacturer to match the original's shape, fit and features, without the automaker's logo | Lower |
| Aftermarket | A general term for non-OEM glass; often used for OEE, but quality and fit can vary by maker | Lowest to moderate |
"Aftermarket" is a loose word. Some people use it for any non-dealer glass, others for lower-priced glass. Ask the shop which brand and type it plans to install.
Do aftermarket windshields meet the same safety standards?
Yes, if they're legally sold in the U.S. Federal Motor Vehicle Safety Standard 205 requires glazing to meet the ANSI/SAE Z26.1 tests (49 CFR 571.205). NHTSA has stated that all windshields made since January 1, 1968 must comply with Standard 205, whatever the age of the car they fit, and that windshield glazing is marked AS-1 (NHTSA interpretation).
The federal standard covers the glass itself: strength, clarity, light transmission and how it breaks. Fit, optical quality at the edges, and how well features like HUD work can still differ between makers.
How do I read the marking on my windshield?
Look in a lower corner for a small printed label, often called the "bug." It tells you who made the glass and that the maker vouches for it meeting the federal standard.
What you'll usually see:
- AS1. The glazing item code for glass that meets the windshield requirements. Windshields are marked AS1.
- DOT number. "DOT" followed by a code NHTSA assigns to the glass manufacturer. FMVSS 205 requires this mark from the prime glazing manufacturer.
- Manufacturer or brand name. On OEM glass you'll also see the automaker's logo.
Labels often carry other codes, such as the maker's own part or plant numbers. The AS1 and DOT marks are the ones that show the glass meets the federal rules for use as a windshield.
Is a cheaper windshield worse quality?
Not necessarily, but price differences can reflect real differences. Two windshields can both meet FMVSS 205 and still differ in how well the edges are finished, how closely the curve matches the car, and how clear the glass is in front of a camera or HUD projector.
Signs of a good fit after install are even gaps around the molding, no wind noise, no water leaks and no wavy distortion when you look through the driver's side. If you see any of those problems, call the installer.
If the automaker's logo appears, it's OEM glass. If there is a glass maker's name and a DOT number but no car logo, it's OEE or aftermarket.
When does OEM glass matter?
For most cars, a quality OEE windshield works and looks the same as OEM. OEM is worth considering in a few cases:
- Heads-up display. HUD windshields use a special wedge-shaped layer. A poor match can cause a doubled or blurry image.
- Some forward cameras. A few camera systems are sensitive to the optical quality of the glass in front of the lens. If calibration fails repeatedly on non-OEM glass, OEM may solve it.
- Lease returns. Some lease agreements require OEM parts. Check your contract.
- Newer or low-volume models. Sometimes OEM is the only glass available yet.
The choice is yours, and it changes the price: OEE is the lower-cost option, OEM costs more. We tell you when we think your car is better off with OEM glass. See windshield replacement for what we install and why.
Will my insurance pay for OEM glass?
It depends on your policy wording. Many policies pay for parts of "like kind and quality," which can mean OEE glass. Others, or optional endorsements, pay for OEM. Read the parts section of your policy or ask your agent.
If your policy pays for OEE and you want OEM, you may be able to pay the difference. California Insurance Code 758.5 lets you choose the shop, but it doesn't decide which glass the policy pays for. See how insurance covers windshields in California.
Does non-OEM glass affect ADAS calibration?
Usually not, if the glass is correct for your VIN and properly installed. The camera bracket, the optical area in front of the lens and the glass shape all have to match. Calibration then confirms the camera reads correctly. Read static vs. dynamic calibration.
Need help?
Tell us your VIN and whether you prefer OEM or OEE, and we'll quote both when both are available. Get a quote or see what drives windshield replacement cost.