Guest Blog: OEM or Aftermarket? How to pick the right replacement parts

Picture a veteran mechanic working on a client’s car, a 10-year-old Ford Focus ST in need of a new starter. It’s a common scenario that comes with an all-too-common dilemma: Should he use an Original Equipment Manufacturer (OEM) part or an aftermarket part? The decision requires our mechanic to weigh multiple factors.

Understanding the differences between OEM and aftermarket auto parts, including the pros and cons of each and how industry trends are influencing their roles, will help our mechanic–and you–make the best possible choice for both the consumer and your auto repair shop.

Defining the terms: OEM & Aftermarket Parts

OEM parts are the components your car was originally built with. These parts are made by the same company that manufactured your vehicle, ensuring a perfect fit and compatibility, as well as reliable performance. For instance, if you own a Honda, Dodge, or Chevrolet, the OEM parts would be made by that manufacturer or its designated suppliers, and typically sold through dealerships or authorized distributors.

Aftermarket parts, on the other hand, are produced by independent, third-party companies. These parts are designed to fit various car models, not just one specific make or model. They encompass a broader range of products, catering to different needs and preferences, i.e., direct replacements, performance upgrades, or custom solutions.

Weighing the pros and cons

OEM pros: As noted earlier, OEM auto parts are identical to those that came with the vehicle. They are known for their consistent quality and perfect fit, which reduces the chances of defects or compatibility problems, and generally means parts will last longer. What’s more, using OEM components often preserves the vehicle's warranty and makes claims easier. Plus, it simplifies the selection process.

OEM cons: Because of their reliable fit and quality, OEM parts do come with a premium price tag. This cost may be justified by the assurance of compatibility and performance, but it’s still a thing, so it may be a deal-breaker for some. Another mark against OEM parts is their availability, especially for older vehicles or discontinued models. You’re also limited in terms of variety.

Aftermarket pros: Compared to OEM parts, aftermarket components are generally more affordable. They also come in a wide variety of options–from multiple suppliers–covering everything from precision performance parts to more budget-friendly choices. Plus, in most cases aftermarket parts are readily available for nearly all makes and models.

Aftermarket cons: The quality of aftermarket parts can vary...a lot. While some brands offer well-built components that may even exceed OEM standards, others produce parts that may not fit as perfectly or last as long. Also, the manufacturer’s warranty can become compromised, or voided, by the introduction of aftermarket parts; or, the parts themselves may come with only a limited warranty.

Shifting gears: industry trends

Among trends impacting today’s aftermarket is the growing popularity of remanufactured OEM parts. These components have been refurbished to meet OEM standards, offering quality at a lower cost than brand-new OEM parts. They’re a solid option for those in search of reliability without breaking the bank.

Aftermarket manufacturers are constantly innovating, especially with performance-enhancing parts designed for electric and hybrid vehicles. Technological advancements like 3D printing are helping suppliers produce components on demand. This technology not only allows for custom designs and rapid prototyping, in many cases it also results in parts that can outperform their OEM counterparts.

Online retailers have transformed the parts market, too, by offering a vast selection of aftermarket parts at competitive prices. Websites like Amazon, RockAuto, and Parts Geek provide extensive catalogs of parts and accessories, along with convenient shipping. Even traditional brick-and-mortar players like O’Reilly Auto Parts and NAPA offer a wide range of products and support through their e-commerce sites.

Pairing the right parts with the right shops

Dealerships typically use OEM parts to ensure factory-recommended repairs. Specialty shops, however, may offer both OEM and high-quality aftermarket parts, depending on their focus–performance enhancements, restoration of classic cars and hot rods, etc.

Quick lube and tire shops often prioritize efficiency and may opt for budget-friendly aftermarket parts for the more routine maintenance items like oil filters and brake pads. This helps them keep services affordable while moving vehicles through their bays at a faster clip.

All shops, however, should prioritize clear communication with customers. Mechanics must explain the options based on each customer's budget and repair needs. For example, a high-performance enthusiast might prefer premium aftermarket parts, while someone focused on longevity could lean more toward OEM parts.

The final verdict... is up to you

Both OEM and aftermarket parts have unique advantages and limitations. Ultimately, the decision on which is best boils down to a handful of factors, including:

Specific Repair: OEM parts are better suited to certain repairs—when it comes to body panels, for example, the manufacturer's equipment is usually preferred.
Vehicle Age: Older vehicles might have more aftermarket options; and, it may be more difficult to locate OEM parts for out-of-production makes and/or models.
Budget: Price can certainly be a deciding factor, although any short-term cost savings should be weighed against potential compatibility and/or durability issues.
Customer Priorities: Individual preferences and priorities often play a role, especially if the car owner is an enthusiast or has a performance expectation or aesthetic in mind.

Important safety note

For critical safety components like brakes or steering, it's best to prioritize OEM or high-quality aftermarket parts. For less critical components, a good quality aftermarket part might be a suitable and cost-effective option.

Parts and parcel

In the debate between OEM and aftermarket parts, there's no one-size-fits-all answer. The best choice will depend on specific situations, needs, and preferences. By understanding the pros and cons of each option, however, you should be well-equipped to make an informed decision that’s right for each customer and vehicle.

Whether the choice is OEM or aftermarket, the right auto repair software ensures that your parts procurement runs smoothly and efficiently.