When getting a windshield replaced in Denver, most drivers are asked one version of the same question: do you want OEM or aftermarket glass? For many vehicles, aftermarket glass that meets OEM-equivalent specifications is a sound, cost-effective choice. For others, particularly newer vehicles with camera-based driver assistance systems, OEM glass is the more reliable option. Here is what you need to know to make the right call for your vehicle.

What Is OEM Glass?

OEM stands for original equipment manufacturer. OEM windshields are either made by the same manufacturer that supplied your vehicle’s factory glass, or sourced from glass that meets the exact same engineering and dimensional specifications. In practice, most OEM windshields are produced by a small number of large glass manufacturers, including AGC, Pilkington/NSG, and Saint-Gobain, regardless of which vehicle brand is on the car.

OEM glass is guaranteed to fit your exact vehicle without modification, preserves factory-grade optical clarity, and maintains full compatibility with any embedded features: rain sensors, HUD (heads-up display) interlayers, acoustic dampening layers, and ADAS camera mounts.

What Is Aftermarket Glass?

Aftermarket windshields are manufactured by third-party glass producers to meet government safety standards (ANSI Z26.1 in the US) but are not made to the original manufacturer’s exact tolerances or specifications. They cost less to produce, which means they cost less to install.

For many vehicles, particularly older models and those without camera-based safety systems, high-quality aftermarket glass from reputable suppliers performs comparably to OEM in everyday use. Fit, optical clarity, and weather sealing are adequate when the glass comes from a credible source.

The category ‘OEM-equivalent’ sits between the two: aftermarket glass manufactured to match OEM specifications as closely as possible, often from the same major glass producers under different part numbers. Competition Auto Glass installs OEM-equivalent glass on standard vehicles where this is the appropriate choice.

When OEM Glass Matters More

OEM glass becomes a more important consideration when any of the following apply:

Your vehicle has ADAS camera systems. Vehicles with lane departure warning, automatic emergency braking, or adaptive cruise control typically use a forward-facing camera mounted to or near the windshield. These cameras are calibrated to the optical properties of the factory glass. Non-OEM glass with slightly different light transmission or tint properties can cause calibration issues or reduce the accuracy of the safety system. For ADAS-equipped vehicles, OEM glass removes this variable.

Your windshield has a heads-up display (HUD). HUD systems project instrument data onto the windshield using polarised light. Aftermarket glass with slightly different polarisation properties can produce double imaging or wash out the display. OEM glass maintains the correct interlayer for clean HUD projection.

Your vehicle has rain or light sensors. These sensors are calibrated to the optical properties of the original glass. Mismatched aftermarket glass can cause sensors to behave erratically, such as wipers running on a dry day or failing to activate in rain.

Your insurance policy specifies OEM replacement. Some comprehensive insurance policies in Colorado include an OEM glass clause requiring the insurer to pay for original manufacturer glass. If this clause applies, you are entitled to OEM replacement at no additional cost.

When Aftermarket Glass Is a Fine Choice

For older vehicles, generally pre-2018, without ADAS systems, rain sensors, HUD, or embedded acoustic layers, OEM-equivalent aftermarket glass from a quality supplier is a cost-effective replacement. The safety standard is the same.

The fit is typically very good. The cost savings are often $100 to $300 less than OEM on common vehicles.

Competition Auto Glass recommends aftermarket glass on applicable vehicles as a practical choice, not a compromise.

What Competition Auto Glass Installs

Competition Auto Glass installs OEM-equivalent glass as the default on standard vehicles without embedded sensor requirements. For vehicles with ADAS, HUD, or where OEM is specified by insurance, OEM glass is sourced and installed. Every installation follows AGRSS guidelines, and ADAS camera recalibration is carried out for applicable vehicles.

If you are unsure which glass type applies to your vehicle, call (720) 239-1133 and the team can confirm before you book.

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Frequently Asked Questions

Does Safelite use OEM or aftermarket glass?

Safelite installs aftermarket glass by default unless OEM is requested or specified by the insurance policy. Some policies include an OEM clause. Check your policy documents if OEM glass is a priority.

Should I replace my windshield with OEM glass?

For vehicles with ADAS cameras, HUD displays, or rain sensors, OEM glass is the safer choice to preserve system accuracy. For older or simpler vehicles, high-quality OEM-equivalent aftermarket glass provides equivalent safety performance at lower cost. Competition Auto Glass can advise on the right choice for your specific make and model.

What type of windshield glass is best?

OEM glass is best for vehicles with advanced safety or display systems. For standard vehicles without embedded technology, OEM-equivalent aftermarket glass from a reputable source provides the same safety performance at lower cost.

Does the type of glass affect my insurance claim?

Some comprehensive insurance policies include an OEM glass clause entitling you to original manufacturer glass at the insurer’s cost. Check your policy or ask Competition Auto Glass to verify your coverage before the replacement is booked.