If your vehicle has been in a collision, you’ll quickly run into one of the biggest debates in the auto repair world: should your shop use OEM parts or aftermarket parts? The decision can affect how your vehicle looks, drives, and protects you for years to come. Yet many drivers don’t know the difference — or that they often have a choice. Here’s a clear breakdown to help you make an informed decision.
What OEM Actually Means
OEM stands for Original Equipment Manufacturer. An OEM part is a new part made by, or under contract for, the company that built your vehicle. The fender on a 2023 Subaru Outback, the bumper cover on a 2022 Volkswagen Atlas, the headlight on a 2024 Chevrolet Silverado — if it comes from Subaru, Volkswagen, or General Motors, it’s OEM. It’s the exact same part that was on your vehicle when it rolled off the assembly line.
What “Aftermarket” Means
Aftermarket parts are new parts made by third-party manufacturers — companies that produce replacement parts independently of the vehicle’s original manufacturer. Some aftermarket parts are excellent. Others are not. Quality, fit, and durability can vary dramatically from one supplier to another. Aftermarket parts typically cost less than OEM, which is why insurance companies frequently push for them when paying for collision repairs.
What About Recycled (LKQ) Parts?
There’s also a third category: recycled parts, sometimes called LKQ (Like Kind and Quality) or simply “used” parts. These are OEM parts removed from another vehicle — typically one that’s been totaled — and resold. Recycled parts can be a good middle ground for some applications (a clean used door shell, for example), but they come with their own considerations: previous wear, unknown history, and inconsistent availability.
The Differences That Actually Matter
On paper, an aftermarket fender and an OEM fender look the same. In practice, there can be meaningful differences:
Fit and Finish
OEM parts are engineered to factory tolerances. They line up with adjacent panels, accept clips and fasteners without modification, and refinish to match the rest of the vehicle. Aftermarket parts often require tweaking — panel gaps may be slightly off, mounting points may not line up, and minor adjustments may be needed during installation. Sometimes the difference is invisible. Sometimes it’s noticeable to anyone who knows what to look for.
Safety and Crash Engineering
This is the most critical category. Modern vehicles are engineered as integrated safety systems. Bumper reinforcements, crumple zones, side-impact beams, and structural panels are designed to absorb and redirect crash energy in specific ways. OEM parts are validated by the manufacturer’s crash engineering. Aftermarket equivalents may or may not perform the same way in a future collision, and most aren’t subject to the same crash testing standards.
Sensor Compatibility and ADAS
Almost every vehicle built in the last decade carries cameras, radars, and sensors that power features like lane-keep assist, automatic emergency braking, blind-spot monitoring, and adaptive cruise control. These systems are calibrated to OEM brackets, mounting points, and surface contours. Aftermarket parts can introduce subtle differences — a slightly different bracket angle, a marginally different bumper contour — that affect how sensors aim and how systems perform. With modern vehicles, this isn’t a theoretical concern. It’s a real one.
Corrosion Resistance and Coatings
OEM parts come with factory corrosion treatments and primers designed to last the life of the vehicle. Aftermarket parts often use thinner coatings or different metals (or different metal alloys) that can corrode sooner — especially in regions where roads are salted in winter, like much of Kentucky.
Warranty Implications
OEM parts are covered by the vehicle manufacturer’s parts warranty. Aftermarket parts come with the third-party manufacturer’s warranty, which may be shorter, more limited, or harder to enforce. Some vehicle manufacturers also note that improper use of non-OEM structural parts can affect collision-related warranty coverage going forward.
When Aftermarket Parts Make Sense
Not every repair calls for OEM. Aftermarket parts can be a reasonable choice on:
- Older vehicles where OEM parts are no longer available
- Cosmetic components that don’t affect crash safety or sensor function
- Repairs where cost is the highest priority and the vehicle is near the end of its expected service life
- Wear items like brake parts or filters — outside the body repair conversation
Our team is always upfront about when aftermarket is a reasonable choice and when it isn’t.
Insurance Companies and Parts Decisions
Most insurance policies allow the insurer to specify aftermarket or recycled parts as long as they’re “of like kind and quality.” That’s where the room for interpretation — and disagreement — lives. Insurance companies are looking to control costs. That’s their job. But it doesn’t mean you’re obligated to accept their default.
Your Rights as the Vehicle Owner
You almost always have the right to request OEM parts on your repair. If your insurance company won’t cover the full cost of OEM, you may have the option to pay the difference yourself, depending on your policy and the part in question. We’ll walk you through what’s covered, what isn’t, and what your options are — before any parts are ordered.
The Bachman Collision Center Approach
As a manufacturer-certified collision center, we follow each automaker’s repair procedures for the vehicles we work on. That means we prioritize OEM parts on safety-critical and structural components, recommend OEM whenever sensor calibration or fit matters, and have honest conversations about when aftermarket or recycled parts make sense. We don’t cut corners on safety, and we don’t inflate costs for the sake of it.
Every repair we deliver is one we’d be comfortable putting our own family in. That’s the standard.
Have Questions About Your Repair?
If you’re facing a collision repair and you’re unsure about parts choices, give us a call or stop by Bachman Collision Center in Louisville. We’ll explain your options, walk you through your insurance company’s position, and help you make the call that’s right for your vehicle and your wallet.
Frequently Asked Questions
What does OEM stand for?
OEM stands for Original Equipment Manufacturer. OEM parts are new parts made by or for the company that built your vehicle — the same parts your vehicle had when it left the factory.
Are aftermarket parts safe?
Some aftermarket parts are well-engineered and perform comparably to OEM. Others are not. Quality varies significantly by manufacturer and by part type. For cosmetic components, aftermarket can sometimes be fine; for structural parts, safety-critical components, and parts that interact with ADAS sensors, OEM is generally the safer choice.
Will using aftermarket parts void my vehicle’s warranty?
Not automatically. Federal law protects consumers from blanket warranty voiding due to aftermarket parts. However, if an aftermarket part directly causes a failure, that specific failure may not be covered. Some manufacturers also note that aftermarket structural parts can affect future collision-related coverage.
Why does my insurance company want to use aftermarket parts?
Cost. Aftermarket parts are typically less expensive than OEM, which reduces what the insurance company has to pay out on your claim. Most policies allow the insurer to specify aftermarket parts “of like kind and quality.” That said, you generally have the right to request OEM — and we’re happy to advocate for that on your behalf when it’s the right call.
Can I demand OEM parts on my repair?
In most cases, yes. You can request OEM parts as part of your repair. Whether your insurance fully covers the cost depends on your policy. If there’s a price gap, you may have the option to pay the difference. We’ll lay out your options clearly before any parts are ordered.
What’s the difference between aftermarket and recycled (LKQ) parts?
Aftermarket parts are new, made by a third-party manufacturer. Recycled or LKQ parts are original OEM parts removed from another vehicle — usually one that’s been totaled. Recycled parts can be a reasonable option for some non-structural components, but the history of the donor vehicle and the condition of the part are critical considerations.
Do aftermarket parts work with my vehicle’s safety sensors?
Sometimes they do, sometimes they don’t. ADAS sensors — cameras, radars, parking sensors — are calibrated to OEM mounting points and surface contours. Even small differences in an aftermarket part can affect calibration accuracy. For vehicles with driver-assist features, OEM parts on sensor-related components are generally the safer choice.
