After a collision, one of the most important decisions that affects the quality, safety, and longevity of your repair is the type of replacement parts used. You may hear terms like “OEM parts” and “aftermarket parts” thrown around by your repair shop, your insurance adjuster, or even a well-meaning friend—but what do these terms actually mean? And more importantly, how does the choice between them affect your vehicle?

At Davis Paint & Collision Auto Center, we believe that informed customers make better decisions about their vehicles. This guide breaks down the key differences between OEM and aftermarket parts so you can understand what goes into your repair and why it matters.

What Are OEM Parts?

OEM stands for “Original Equipment Manufacturer.” These are parts made by the same company that built the original components installed in your vehicle at the factory. When you choose OEM parts for a collision repair, you’re getting components that are identical in material, fit, and performance to the ones your car came with.
For example, if you drive a Toyota Camry and need a new fender after a collision, an OEM fender would be manufactured by Toyota (or their authorized supplier) using the exact specifications, materials, and quality controls as the original. It’s designed to fit precisely, match the factory paint codes, and meet Toyota’s engineering and safety standards.

What Are Aftermarket Parts?

Aftermarket parts are manufactured by third-party companies that are not affiliated with your vehicle’s original manufacturer. These companies reverse-engineer parts to function as replacements for OEM components. Aftermarket parts are widely available and are typically less expensive than their OEM counterparts.

The quality of aftermarket parts can vary significantly. Some aftermarket manufacturers produce components that are very close to OEM standards, while others cut costs by using thinner metals, different plastics, or less precise molds. Because there is no universal quality standard for aftermarket collision parts, the consistency and reliability can be unpredictable.

Key Differences Between OEM and Aftermarket Parts

Fit and Finish

OEM parts are designed to be a direct, exact replacement. They align with your vehicle’s body lines, mounting points, and panel gaps without modification. Aftermarket parts may require additional adjustments during installation. Gaps between panels, uneven surfaces, or slight misalignments are common complaints with lower-quality aftermarket components. These fit issues can affect not only the appearance of your vehicle but also how well it seals against water, wind, and road noise.

Material Quality

Vehicle manufacturers select specific materials for each component based on crash testing, structural analysis, and durability requirements. OEM parts replicate these material choices precisely. Aftermarket manufacturers may substitute different grades of steel, aluminum, or plastic to reduce production costs. While this doesn’t always result in an inferior part, it does introduce an element of uncertainty—particularly for structural or safety-related components.

Safety Performance

Modern vehicles are engineered as integrated safety systems. Crumple zones, airbag sensors, and structural reinforcements are designed to work together during a collision to protect occupants. OEM parts have been tested as part of this system and are guaranteed to perform as intended. Aftermarket parts generally have not undergone the same crash testing or safety validation. Using a non-OEM structural component could potentially alter how your vehicle absorbs and redirects impact energy in a future collision.

Warranty Considerations

OEM parts typically come with a manufacturer’s warranty that provides coverage if the part is defective. Many aftermarket parts also carry warranties, but the terms, coverage, and claims process can vary widely depending on the manufacturer. It’s also worth noting that using non-OEM parts on a newer vehicle could potentially affect your factory warranty coverage, depending on the circumstances and the manufacturer’s policies.

Resale Value

When it comes time to sell or trade in your vehicle, the quality of previous repairs matters. A vehicle that has been repaired with OEM parts will generally retain more of its value than one repaired with aftermarket components. Savvy buyers and dealerships often check for repair quality, and OEM parts are a sign that the vehicle was properly restored to its original specifications.

Why Certified Body Shops Prefer OEM Parts

Manufacturer-certified collision repair centers, like Davis Paint & Collision Auto Center, are trained and equipped to repair vehicles according to the manufacturer’s exact specifications. Part of maintaining these certifications—from Toyota, Ford, GM, Nissan, Hyundai, Kia, and FCA—involves following OEM repair procedures, which includes using OEM parts whenever possible.

These certifications aren’t handed out lightly. Shops must invest in specialized training, equipment, and tooling to earn and maintain them. Using OEM parts ensures that the repair meets the same standards the vehicle was built to, which is why certified shops strongly advocate for their use.

When Aftermarket Parts Might Be Considered

There are situations where aftermarket parts may be a reasonable option. On older vehicles where the cost of OEM parts significantly exceeds the vehicle’s value, or for cosmetic-only components on non-structural areas, a high-quality aftermarket part might be an acceptable alternative. Additionally, some aftermarket parts—such as performance upgrades or accessories—are specifically designed to improve upon the original specifications.

The key is making an informed choice. Understanding what type of part is being used, where it comes from, and how it might affect your vehicle’s safety and value gives you the power to make the right decision for your situation.

How to Ensure Your Repair Uses the Right Parts

When you bring your vehicle in for collision repair, don’t hesitate to ask questions about the parts being used. Here are a few things to keep in mind:

  • Ask your repair shop directly whether OEM or aftermarket parts will be used in your repair.
  • Request OEM parts if safety and fit are a priority. You have the right to specify the type of parts used on your vehicle.
  • Choose a certified collision repair center that follows manufacturer repair procedures and has the training and equipment to install OEM parts correctly.
  • Review your repair estimate carefully to see which parts are listed and whether they are identified as OEM (often noted as “New OE”) or aftermarket (often noted as “AM” or “QRP”).

Get the Right Parts at Davis Paint & Collision Auto Center

The parts that go into your repair are just as important as the technicians performing the work. As an I-CAR Gold Class facility with manufacturer certifications from Toyota, Ford, GM, Nissan, Hyundai, Kia, and FCA, Davis Paint & Collision Auto Center has the training, tools, and direct access to OEM parts needed to restore your vehicle to factory specifications. We’ll walk you through your parts options, explain the differences, and help you make the best choice for your vehicle and your budget.

With three convenient locations across the Oklahoma City area, our team is nearby and ready to help:

Oklahoma City Location – Call 405.733.9797
South Oklahoma City Location – Call 405.691.1820
Midwest City Location – Call 405.732.0762

Have questions about what parts are being used in your repair? Give us a call or stop by—we’re always happy to show you exactly what’s going into your vehicle and why.