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A Comprehensive Guide

OEM vs. Aftermarket Parts

No matter how well you care for your new Mercedes-Benz vehicle, at some point, it’ll require new parts. When it comes to parts shopping, car owners have no shortage of options. You may be asking yourself, “What is OEM?” or, “What are the differences between OEM and aftermarket parts?” Truthfully, it’s best to narrow down your choices to the part that’ll save you money in the long run, perform optimally, and do your vehicle justice. To make life easier for drivers in and around Eastvale, we’ve compared OEM parts vs. aftermarket parts below.

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What Does OEM Mean?

It’s stressed by most automakers, especially Mercedes-Benz, to use parts that were built for your vehicle alone, be it genuine or OEM. Below we break down “genuine” and “OEM” meanings:

  • OEM Definition: OEM stands for Original Equiptment Manufacturer. If a part is labeled “OEM,” it was manufactured by the same company that built the original component for the automaker. In form and function, it’s identical to the genuine part that came with your vehicle when you first drove it home.
  • Genuine Part Definition: If you compare OEM vs. genuine parts, you’d find no difference, other than genuine parts are stamped with the automaker’s logo.
Handling Parts

What Are Aftermarket Parts?

Aftermarket parts are also referred to as competitive replacement parts, generic parts, and non-OEM parts. All aftermarket parts share these commonalties:

  • They’re made by a company other than the original manufacturer of your vehicle.
  • They’re built to accommodate a variety of vehicles—not just yours.
  • They’re easy to find. You can visit just about any independent auto shop near Rancho Cucamonga and browse spark plugs, starters, gas tanks, and more.

Compare OEM vs. Aftermarket



Compare OEM vs. aftermarket parts in cost, and you’ll find generic parts are usually cheaper than genuine and OEM parts; however, that doesn’t necessarily mean you’re getting a bargain. Keep in mind that aftermarket parts are made for many different vehicles, while Mercedes-Benz OEM parts are crafted with quality as the rest of your Mercedes-Benz vehicle. To reduce production costs in aftermarket parts, many companies:

  • Use inferior, low-quality materials
  • Sell parts without warranty coverage

At Mercedes-Benz of Ontario, all of our Mercedes-Benz OEM parts come with a Parts Limited Warranty as a part of our Extended Warranty plan because we know that no part is 100-percent fail-safe. In addition, we offer new parts specials every month, so Chino and Fontana drivers can get what they need for less.



For greater reliability, Mercedes-Benz designs its parts from scratch, right down to the filters, lines, and belts. Using an aftermarket part in a Mercedes-Benz can lead to problems and pricey repair bills—and here’s why:

  • Mercedes-Benz and AMG® collaborate to build pieces specifically for race-ready performance—so professional AMG® service and parts installation is key.
  • Mercedes-Benz doesn’t share much about its engineering to the public; it’s tough at best for generic parts manufacturers to duplicate their Mercedes-Benz OEM parts.
  • If it can be proven that an aftermarket part caused the need for repairs on your vehicle, your warranty coverage may be jeopardized.
Moon Roof


Once of the most popular questions raised in the OEM vs. aftermarket parts debate is, “How safe are aftermarket parts?” It’s important to weigh the dangers of using aftermarket parts, especially if you drive a premium vehicle:

  • Many aftermarket parts are authorized by the Certified Automobile Parts Association (CAPA)—but not all.
  • Luxury vehicles are top performers. Using an aftermarket brake component, for example, could be dangerous, as the part likely won’t fit with the rest of the system like an OEM part would.
  • Due to the overwhelming choice of aftermarket parts, it can be confusing for customers to determine the parts they need. Picking the wrong part can cause both safety and performance issues, as well as waste your money.

Order OEM Mercedes-Benz Parts in Ontario!

Mercedes-Benz of Ontario near San Bernardino and Fontana offers a selection of over 100,000 Mercedes-Benz OEM parts and AMG® parts—each backed by a Parts Limited Warranty. In addition, we offer Express Service for simple parts installations, such as wiper replacement and filter changes. If you’d like to place an order for OEM parts or have questions about which part is best for your vehicle, contact our parts team today!

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