OEM vs. Aftermarket Parts: What's the Difference? | Gandrud Chevrolet | Green Bay, WI

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OEM vs. Aftermarket Parts

What each type of replacement part actually means, where the difference matters most, and how to decide before your next repair.

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If you've ever needed car repair work done, you've probably heard the shop owner or car mechanic ask whether you want original or aftermarket parts for your repair. And you've probably wondered, "Wait, what's actually the difference?"

At Gandrud Chevrolet, this is one of the top questions we hear from customers, and it is an important one to know the answer to before you make a decision that impacts performance, safety, and resale value. Here's more information about what the difference is between OEM and aftermarket parts.

What Is the Difference Between Aftermarket and OEM Parts?

Original Equipment Manufacturer

OEM Parts

OEM stands for Original Equipment Manufacturer. These are parts made by the manufacturer that built your car, or a supplier that works directly with that manufacturer, to the exact specifications of your vehicle. In other words, if your car came off the factory line with a particular headlight, alternator, or brake part, an OEM replacement would be virtually identical to what was there before.

Built to the exact specifications of your vehicle
Usually fit like a glove
Consistent, known quality

Third-Party Manufacturers

Aftermarket Parts

Aftermarket parts are parts made by a completely different company that is not associated with the manufacturer of the vehicle. They fit in the same way and look similar to the original, but they are different in that they are made to different specifications. While there are many companies that make aftermarket parts, the quality can vary significantly, ranging from very reputable companies to quite disreputable ones.

Made to different specifications
May require modification to fit
Quality varies widely by manufacturer

Fit, Performance, Durability

Why This Difference Actually Matters

At first, this may seem like a minor detail, but it can actually have a few major effects on your vehicle. Fit is one of the biggest factors. Because OEM parts are manufactured to the exact specifications of the original equipment manufacturer, they usually fit like a glove. Alternatively, aftermarket parts may not fit as well, and some may require modification to fit or may actually cause issues in the future.

In terms of performance and durability, a high-quality aftermarket part may function as well as an original part, whereas a low-quality aftermarket part may not last as long or perform as precisely as an original. That's part of why taking the time to do a little research or asking a reliable shop matters when selecting replacement parts.

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Is It Better to Buy OEM Parts or Aftermarket?

This really is the crux of the issue and, honestly, whether it is better to buy OEM parts or aftermarket parts is going to come down to how much you want to spend, how long you plan to keep the car on the road, and whether or not the part affects the safety or major performance of the car.

Where OEM Makes Sense

OEM parts are best suited for critical items like brakes, airbags, and engine parts, where safety and performance can be compromised. Most drivers prefer the security of using OEM parts on critical components where there is no such guarantee of quality and fit with aftermarket parts.

Where Aftermarket Can Work

For small items such as trim pieces, mirrors, or some electrical accessories, aftermarket parts may be cheaper and equally as effective.

Cost is often the biggest reason that people consider an aftermarket part over an OEM part. Aftermarket parts are usually cheaper than OEM ones, and this can be meaningful on larger repairs. Just keep in mind that you may be paying more over the life of the part if it doesn't last as long.

Where to Buy

Looking for Genuine OEM Parts Near Me or Aftermarket Parts Near Me?

If you're looking for genuine OEM parts near me, your best bet is to check our dealership first. We have OEM parts made especially for your make and model from the manufacturer.

Another commonly searched term is aftermarket parts near me, especially when you're looking to save money on a minor repair. Regardless of which type of parts you choose, you should always consult someone knowledgeable before making a purchase, since some aftermarket parts may not be a good choice.

Speaking with an expert will help you avoid parts that may seem like a good deal but could cause issues down the road.

Ask Our Parts Team

How We Can Help You Decide

We know this decision can be a little overwhelming, especially if you've never had to think about it before. That's exactly why our team at Gandrud Chevrolet is here to walk you through your options in plain language that makes sense, without any pressure to choose one path over the other. We can explain what a specific repair actually needs, what your realistic choices look like, and which option makes the most sense for your budget and your long-term plans for the vehicle.

Feel free to come in or call us, even if it's a small repair or you are just considering making one. Sometimes, it only takes a phone call with someone who is familiar with your car to save you a lot of guesswork and often a fair amount of money, too.

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919 Auto Plaza Dr.
Green Bay, WI 54302
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Part availability, pricing, and warranty coverage vary by part, vehicle, and manufacturer. Aftermarket part quality differs between manufacturers. This page is general information; contact Gandrud Chevrolet to discuss the parts your specific repair requires.