OEM parts are made by the original manufacturer of your equipment, not by a third party
OEM stands for Original Equipment Manufacturer. When a part breaks on something you own — a car, appliance, phone, or tool — an OEM replacement part is one made by the company that built the original product. If your refrigerator is a Samsung and you need a new compressor, Samsung makes the OEM compressor for that model. If you drive a Honda and need brake pads, Honda makes the OEM brake pads for your specific year and model.
The alternative is an aftermarket part, made by a different company. Aftermarket parts are often cheaper, but they are not made by the original manufacturer and may not fit or perform exactly like the original. Understanding the difference matters because it affects cost, warranty coverage, and whether the part will work the way you expect.
Key Takeaways
- OEM parts are manufactured by the company that made your original product and are designed to fit and perform exactly like the part they replace.
- OEM parts typically cost more than aftermarket alternatives but often come with a manufacturer warranty that covers defects.
- You can find OEM parts through the manufacturer's official website, authorized dealers, or by calling customer service with your product's model number.
- Some products require OEM parts to maintain warranty coverage, while others allow aftermarket parts without penalty — check your warranty terms first.
- Aftermarket parts may work well for some repairs but carry more risk of fit problems, performance issues, or voiding your warranty.
How OEM parts differ from aftermarket parts
An OEM part is engineered to the exact specifications of your product. The manufacturer has tested it, knows how it performs, and stands behind it. When you buy an OEM part, you are getting something the company has already verified works in your specific model.
An aftermarket part is made by a different company — sometimes a well-known brand, sometimes a generic supplier. It may be designed to fit your product, but it was not made by the original manufacturer and was not tested in your exact model. Aftermarket parts range widely in quality. Some work just as well as OEM parts and cost significantly less. Others fit poorly, wear out faster, or cause unexpected problems.
The risk with aftermarket parts is that you do not know how they will perform until you install them. With OEM parts, the manufacturer has already done that work.
Where to buy OEM replacement parts
The most direct route is the manufacturer's official website. Most large companies have a parts section where you can search by product model number. You enter your model number, find the part you need, and order it directly. This guarantees you are getting a genuine OEM part.
Authorized dealers are another reliable source. These are retailers the manufacturer has approved to sell their parts. A car dealership for your vehicle brand, an appliance store that carries your refrigerator brand, or a phone carrier for your phone model — these are all authorized dealers. They stock OEM parts and can often install them for you.
Some large retailers like Amazon, Best Buy, or Walmart also sell OEM parts, but you need to verify the seller is authorized by the manufacturer. Check the product listing carefully — it should state "OEM" or "Official [Brand Name] Part" and show the manufacturer as the seller or a verified authorized distributor.
Avoid buying OEM parts from unknown sellers on marketplace sites. Counterfeit parts exist, and a cheap listing from an unverified seller is often a sign the part is not genuine.
What information you need to find the right OEM part
The most important piece of information is your product's model number. This is usually printed on a sticker or label on the product itself — inside the battery compartment of a phone, on the back of an appliance, under the hood of a car, or on the frame of a tool. Write down the exact model number before you search.
You will also need to know what part you are looking for. "My refrigerator is broken" is not specific enough. "The compressor is not running" or "the ice maker stopped working" tells the parts department exactly what to send you. If you are unsure which part failed, take a photo of the broken part or describe what is not working, and the manufacturer's customer service can help you identify it.
For some products, the year of manufacture matters. A 2015 Honda Civic and a 2020 Honda Civic may use different brake pads, even though they are both Civics. The manufacturer's website will ask for this information and show you only the parts that fit your specific year and model.
Cost differences between OEM and aftermarket parts
OEM parts are almost always more expensive than aftermarket alternatives. How much more depends on the product and the part. A replacement battery for a phone might cost $40 to $80 from the manufacturer but $15 to $30 from an aftermarket seller. A car transmission part might cost $200 from the dealer but $100 from an aftermarket supplier.
The higher cost reflects the fact that the manufacturer has engineered, tested, and warranted the part. You are paying for that certainty. With an aftermarket part, you are saving money upfront but taking on the risk that it may not fit perfectly, may not last as long, or may cause other problems.
For critical parts — things that affect safety or the core function of the product — the extra cost of an OEM part is often worth it. For cosmetic parts or parts that are straightforward to replace again if they fail, an aftermarket part may make sense if you are on a tight budget.
How OEM parts affect your warranty
Many manufacturers require you to use OEM parts to keep your warranty valid. If you use an aftermarket part and something goes wrong, the manufacturer may refuse to cover the repair under warranty. Check your product's warranty document before you buy a replacement part.
Some warranties are more flexible. They may allow aftermarket parts as long as the part itself is not what failed. For example, if your phone's screen breaks and you replace it with an aftermarket screen, the manufacturer might still cover a battery defect under warranty — but they will not cover screen problems.
If your product is still under warranty, contact the manufacturer before buying any replacement part. They can tell you whether using an aftermarket part will affect your coverage. If the product is out of warranty, you have more freedom to choose aftermarket parts without penalty.
When OEM parts are worth the extra cost
OEM parts make the most sense when the part is critical to safety or the core function of your product. Brake pads for a car, a battery for a phone, a compressor for a refrigerator, or a motor for a washing machine — these are parts where failure can cause bigger problems or safety risks. Spending more on an OEM part reduces the chance of a poor fit or early failure.
OEM parts also make sense if your product is still under warranty. Using an OEM part protects your warranty coverage and ensures the manufacturer will stand behind the repair if something goes wrong.
If you are not sure whether a part is critical, ask yourself: if this part fails again in six months, how much will it cost to replace it, and how much inconvenience will it cause? If the answer is "a lot," buy the OEM part. If the answer is "not much," an aftermarket part is a reasonable choice.
Frequently Asked Questions
Is a counterfeit OEM part the same as an aftermarket part?
No. A counterfeit part is a fake — it is made to look like an OEM part but is not made by the manufacturer. An aftermarket part is honest about who made it. Counterfeits are worse because they may not work at all and are often sold by scammers. Buy only from the manufacturer or an authorized dealer to avoid counterfeits.
Can I install an OEM part myself, or do I need a technician?
It depends on the product and the part. Some OEM parts are designed for consumer installation — a phone battery, a car air filter, or a printer cartridge. Others require special tools or training — a car transmission, an appliance compressor, or a phone screen. Check the manufacturer's instructions or ask the dealer whether installation is included with your purchase.
What if the OEM part I ordered does not fit?
Contact the manufacturer or the seller when ready. If you ordered from the manufacturer's website or an authorized dealer, they will usually replace it or refund you. Make sure you ordered the correct part for your exact model number — the most common reason for a poor fit is ordering the wrong version by mistake.
Are OEM parts always better quality than aftermarket parts?
OEM parts are designed specifically for your product and carry the manufacturer's warranty, which usually means better quality control. But some aftermarket brands have excellent reputations and perform just as well. The difference is that with OEM parts, you know what you are getting because the manufacturer has tested it.
How long do OEM parts usually last?
That varies by product and part. An OEM phone battery might last two to three years. An OEM car battery might last three to five years. An OEM appliance part might last ten years or more. The manufacturer's documentation usually gives you an expected lifespan, and the warranty tells you how long the manufacturer will cover defects.