OEM vs. Aftermarket Parts for Your Car: How to Choose

[APF]

When selecting parts for a car repair, it pays to know the differences between original and aftermarket parts. Whenever possible, get estimates for both.

Choosing between original and aftermarket car parts — and even used parts of either type — is all about squaring your priorities with your budget.

You’ll have different options depending on the part and the shop. And the best choice will depend on whether you’re trying to keep repairs cheap, restore your car’s appearance after a wreck or soup up your ride.

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Before we get into that, here are the key differences:

Original equipment manufacturer (OEM) parts match those that came with your car, and are of the same quality as its original parts. They’re also the most expensive.

Aftermarket parts are cheaper, and made by other manufacturers — often several, giving you more options.

Used parts may have a bit of wear and tear, but should be inspected or rebuilt to ensure they’ll work. These are the cheapest option.

Choosing between aftermarket and OEM parts

Your decision will depend on the type of repair and the quality and price of the parts. Always look for parts that come with a warranty, even if they’re OEM, so you’ll be protected in case they fail.

Auto body repairs

Some aftermarket parts may be OK for 

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, but others won’t be as good, says Michael Calkins, manager of technical services at AAA. “There’s a lot of variation in quality.” For example, he says, aftermarket parts often don’t have the same level of rustproofing as original parts, fit and finish don’t match, or panels don’t align properly.

Ultimately your decision will depend on the type of repair and the quality and price of the parts.

If OEM parts are used in auto body repair, the car should look and work exactly as it did before the damage, because everything will match up. OEM parts are also crash-tested, unlike many aftermarket parts.

Aftermarket parts come at varying price points and levels of quality, but because they are cheaper, insurance companies often prefer them. If you want OEM parts but are dealing with an insurer that wants the shop to use aftermarket parts, ask to pay the difference.

“There’s also the option of used parts, depending on the age of the vehicle,” Calkins says. “It may be cheaper than an aftermarket part but still have all of the original quality.”

Mechanical repairs

A used part, whether it’s OEM or aftermarket, can really save money on repairs under the hood, so long as it’s inspected first and warrantied. And some aftermarket companies reverse-engineer their products to be even better than OEM versions.

Some companies reverse-engineer aftermarket parts to be even better than OEM versions.

For example, many car buffs will tell you that you can get heavy-duty shocks and struts or brake pads that are made of stronger materials. Scan some reviews online, or talk with your mechanic if you’re not sure whether an aftermarket part could be an upgrade.

Adding some extras

If you’d like to modify your ride by adding something like a backup camera or back-seat TV screen, you’ll probably be looking for aftermarket parts. Certain aftermarket upgrades could increase 

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. This is especially true for improvements like a better sound system or alloy wheels, rather than mechanical repairs.

Who provides OEM or aftermarket parts?

The options you’ll have for parts depends on the nature of the repairs and what type of shop you take your car to:

• • Dealership repair shops will offer only OEM parts — they have no reason to offer a cheaper product from a competitor
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     may be able to offer you a choice between OEM and aftermarket parts
  • Independent garages that specialize in your type of vehicle will likely have both, but with quicker access to OEM parts, including used OEM parts, which can really save you
  • Auto body shops can offer both, but if your collision repair is part of an insurance claim, the insurer will likely prefer aftermarket parts to save money

Depending on the job, the cost of OEM versus aftermarket parts varies. Whenever you’re given the choice, ask to see estimates for both so you can weigh your options.

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[EllenJ90]

I prefer to buy aftermarket car parts instead of OEM due to the fact that aftermarket car parts are less costly as compared to OEM. Choosing aftermarket car parts gives you a variety of options and they are easily available, whereas OEM parts on the other hand are not readily available and in order to purchase an OEM part you will have to contact your care manufacturer. Lastly, and most importantly, aftermarkets parts have been known to perform better then the original parts in certain cases.

[CustomCarParts]

@EllenJ90: This is also the feedback from our customers. Most mechanic parts break for a certain reason (if it's not a crash), so we offer rebuilds of those parts with the options of re-engineering and different materials than the originals.

 

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[troy jackson]

Choosing between OEM and aftermarket parts depends on your priorities. OEM parts guarantee a perfect fit and original performance but are more expensive. Aftermarket parts are often cheaper with more options, but quality varies. Opt for OEM for warranty concerns or reliability and aftermarket for cost savings with trusted brands.

[Athrelle]

Choosing between OEM (Original Equipment Manufacturer) and aftermarket parts really depends on your priorities. If you value quality and a perfect fit, OEM parts are usually the safer choice. They’re made specifically for your car, so there’s less guesswork involved. For example, I’ve used

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 to find OEM parts for my Trailblazer, and it’s been hassle-free every time.

On the other hand, aftermarket parts can be more affordable and sometimes offer performance upgrades that OEM parts don’t. Just be cautious with compatibility and quality, as not all aftermarket options are created equal.

For me, it comes down to how critical the part is—OEM for reliability and fit, aftermarket for customization or savings. Me personally I still go with OEM coz it's saves me money in terms of quality of the part instead of worrying the part breaking down in any given time.

[WiperTech008]

Whether I go for OEM or aftermarket parts really depends on how important the part is. For something major like the engine, I usually stick with OEM. But for smaller stuff like wiper blades, I always go aftermarket.

[marqsmiths]

OEM (Original Equipment Manufacturer) parts are made by your car's maker and guarantee perfect fit and quality—but usually come at a higher price. Aftermarket parts, on the other hand, are produced by third-party companies and often offer better affordability and a wide range of choices without sacrificing performance.

If you're looking for cost-effective, durable, and widely available options, aftermarket parts are a smart choice—especially for businesses sourcing components in bulk.

For quality-tested solutions, many industry professionals trust companies offering wholesale trailer supplies and auto components at scale. It's a practical way to get reliable parts without overpaying.

Edited June 18, 2025 by marqsmiths

[Sacerltd]

Great topic! The choice between OEM and aftermarket depends on your priorities—cost, quality, or specific performance needs. At Sacer Ltd, we bridge that gap: Our aftermarket actuators meet OEM-grade standards (backed by 55+ patents) at competitive prices. For critical systems, we always recommend parts with proven reliability—whether OEM or certified alternatives. Curious about a specific component? Happy to share insights!

Edited July 3, 2025 by Sacerltd