What Is the Difference Between OEM and Aftermarket Parts
OEM parts are made by your car's manufacturer, aftermarket parts are made by other companies, and your insurance policy usually decides which one gets used.
OEM means original, aftermarket means an alternative
OEM stands for original equipment manufacturer. An OEM part is made by the same company that built your car, or made for them under their name. An aftermarket part is made by a different company to fit your car, but it didn't come from the manufacturer.
Which one goes on your car after an accident usually comes down to your policy, not your preference. Many policies allow aftermarket parts for repairs unless you've paid extra for OEM coverage. Check your policy or ask your agent which one applies to you.
Your policy's parts clause decides more than the part itself
Most auto policies have a line about what kind of parts the insurer will pay for in a covered repair. If yours doesn't specify OEM, the insurer can authorize aftermarket parts, and the shop doing the work has to use them.
Some insurers offer an endorsement that guarantees OEM parts for repairs, usually for an added cost. This matters more on newer cars, where panels and components are still under the manufacturer's own warranty, and less on older cars where that warranty has already run out.
If you want OEM parts guaranteed after an accident, this is the thing to ask your insurer about directly. Don't assume it's included unless you've confirmed it.
Fit and finish are the common complaint, not safety
Aftermarket parts are regulated and tested, and for most things like bumpers, fenders, and mirrors, they do the job. The complaints that come up most are about fit, the way panels line up, and finish, how well the paint matches.
For structural or safety parts, some states and insurers draw a tighter line, requiring certified aftermarket parts that meet specific standards rather than any aftermarket part. Your state's rules on this vary, so ask your shop or insurer which standard applies to your repair.
If a repair doesn't look or feel right after aftermarket parts were used, you can usually raise it with the shop or your insurer before signing off on the work.
Questions people ask about this
Can I request OEM parts after an accident?
You can ask, but whether the insurer pays for OEM parts depends on your policy. If your policy doesn't include an OEM endorsement, you may have to pay the difference in cost yourself.
Do aftermarket parts void my car's warranty?
Generally no, a manufacturer can't void your whole warranty just because an aftermarket part was used in a repair. But if that specific part causes a problem later, the manufacturer may not cover the damage it caused. Check your warranty terms if this concerns you.
Are aftermarket parts used for leased cars too?
It depends on your lease agreement as much as your insurance policy. Some leases require OEM parts for any repairs during the lease term, so check your lease paperwork before an accident happens, not after.
Who decides which parts are used in a repair?
The insurer authorizing the claim and the shop doing the repair make this call together, based on what your policy allows. You can ask questions, but the final decision usually isn't yours unless you're paying out of pocket.
Does using aftermarket parts affect my car's resale value?
It can, especially if the parts are visible or affect how the car looks or runs. Keeping records of what was replaced and with what can help if a future buyer or appraiser asks.
If you want a policy that's clear about which parts it covers, it helps to compare what different insurers offer.
Pull out your current policy and find the section on repairs or parts coverage. If it doesn't mention OEM or aftermarket parts specifically, call your agent and ask directly which one applies to you. If you want OEM parts guaranteed, ask what an endorsement for that would cost and whether it makes sense for your car's age. If you're shopping for a new policy, ask each insurer the same question so you can compare answers directly rather than guessing from the fine print.
