The Pros and Cons of OEM and Aftermarket Auto Parts

When it comes to vehicle repairs, you’ll need to answer an important question.

Should you purchase OEM (Original Equipment Manufacturer) parts or aftermarket parts?

An argument can be made for both, as both options have pros and cons. Not all auto parts are created equal. Knowing the advantages and disadvantages will help you make better-informed decisions.

In today’s post, we’ll explore OEM vs. aftermarket parts: their difference and how they stack up in terms of quality and affordability.

I | What are the differences between OEM vs. aftermarket parts?

Aftermarket Parts

Aftermarket or generic parts are auto components not created by the vehicle manufacturer. They’re generic because manufacturers design them to fit a wide range of different vehicles. Because of their general specifications, aftermarket parts may lack the ‘glove fit’ you’d receive from an OEM part.

To achieve the exact fit, your mechanic has to make extensive adjustments. Modifying the part creates a whole new set of problems, depending on the expertise of your mechanic. The mods may or may not work. If it doesn’t, you’ll be looking at finding money to replace the replacement. If you’re already riding on a low budget, this will incur unplanned expenses.

Since numerous manufacturers produce these generic parts, you have countless options to choose from on the market. This also means they are the cheapest option upfront. Unless, of course, you need extensive modifications for the perfect fit.

Among non-OEM parts, you’ll find branded and unbranded options. The quality of recent branded aftermarket parts may be as good as, or better than, OEM parts. Unbranded options receive low ratings from professional auto technicians due to their unpredictable quality.

OEM Parts

You’ll find two definitions for OEM parts. In one instance, the term refers to official parts produced by the vehicle’s original manufacturer, not a third-party manufacturer or subsidiary of the engine manufacturer.

The second explanation broadens the definition to include parts automotive manufacturers buy from vehicle component manufacturers. These outsourcing vendors design and produce components to meet the manufacturer guidelines provided by an auto manufacturer.

II | Pros and Cons of OEM vs. Aftermarket

Ultimately, choosing between OEM and aftermarket parts will come down to your budget. Understanding the advantages and disadvantages you face for each can eliminate any nasty surprises down the road.

OEM Review

PROS:

They provide added safety, value, and dependable performance.

OEM fans swear by the unrivaled degrees of quality found in OEM parts.

An OEM component is an exact replacement for the original parts of your vehicle. They all have the exact specifications in measurements, fitting, finishing, and the same high-quality materials. These parts are created for your vehicle’s exact make and model from design to testing.

OEM parts undergo rigorous testing from the manufacturer to meet the highest governmental standards. This stamp of approval gives them high ratings for consumer safety and quality assurance. Many auto owners see this as a perk worth the extra cost since it provides them peace of mind.

You don’t always know what you’ll get with aftermarket products. Their quality varies as they don’t face the same scrutiny as parts from well-known automotive manufacturers.

The parts are easier to use.

Using OEM parts subtracts the guesswork involved in sourcing the right components. It also means seamless integration of replacement electrical components. Because the part you purchased was designed for your make and model, modifications will be minimal.

You’re essentially guaranteed a 100% fit.

Manufacturer Warranty

OEM parts typically come with a limited warranty of up to a year.

CONS:

They can be expensive.

OEM parts can cost more than comparative aftermarket parts. Dealerships markup the prices for increased profits, charging a premium for parts, services, and warranties.

Limited suppliers and potential waiting time

Although OEM parts are easier to install, they may take longer to find. If the parts you require aren’t in stock at a dealership, they’d have to order them for you. The same goes for your mechanic. Machine shops and mechanics can send in orders, but they can’t avoid the markups and the additional time for delivery.

Their superior quality might be oversold.

OEM parts offer peace of mind with the guarantee that you’re purchasing a part that fits better than a third-party component. However, in recent years, aftermarket suppliers have upped the quality of their products to rival their OEM counterparts. The improvements accomplished by reverse engineering the original manufacturing process narrow the differences between OEM and aftermarket parts.

Aftermarket Review

PROS:

They’re a cheaper option for OEM parts

Aftermarket parts are appealing because they usually cost less than OEM parts. The margin of savings depends on the brand.

Shop for the best price and an idea of the part’s price range. If the cost of a replacement seems too good to be true, ask questions about its quality. Seek advice from your mechanic or local auto body repair shop. They might have recommendations for you as well.

Some branded aftermarket parts match or surpass the quality of their OEM counterpart.

Major aftermarket manufacturers go the extra mile in matching or outperforming the quality of OEM parts. They give you excellent quality products plus cost savings without compromising automotive performance and comfort.

It’s all about hunting down a reliable aftermarket parts manufacturer. You’re bound to encounter lesser-quality aftermarket versions with the various alternatives available. Scan online reviews or talk with your mechanic about generic products that match their OEM counterparts.

Non-OEM parts are readily available.

There are hundreds of aftermarket parts manufacturers in the US. Some specialize in specific components, while others, like NAPA, feature broader offerings. Some focus on a single vehicle brand, while others cast a wider net.

CONS:

No warranty.

Many aftermarket producers minimize the cost by not offering a manufacturer warranty. Big-name companies, however, typically provide at least a one-year warranty in keeping with OEM offers.

You may require extensive modifications.

As I mentioned, non-OEM parts often require modifications for a precision fit. The extent of the changes can sometimes cost the same or more than the OEM part itself.

Not all mechanics are skilled enough to execute the modifications and maintain optimal quality standards. Ill-fitting parts will weaken the structural integrity of your vehicle and compromise your safety.

The vast differences in quality standards.

Without strict regulations, there are no guarantees that non-OEM parts will meet the exact specifications of the original auto components.

Body panels like aftermarket bumper covers, hoods, and fenders vary in specs between OEM and aftermarket products. These discrepancies affect the panel’s alignment. Not to mention, the sheet metal and finishing quality of a non-original panel might not reach the standard of an OEM part. Low-quality parts increase the likelihood of corrosion problems developing.

Safety might be an issue.

The lack of heavy regulation also affects the safety standard of some of these parts. Many aftermarket parts aren’t crash-tested and come with shorter life spans as they’re prone to component failure. Be careful of which auto parts supplier you use, and always seek reputable, professional advice.