Somewhere in the middle of a collision repair, a question comes up that most drivers never expected to think about: what kind of parts are going back on your car? It sounds like a technicality. It isn't. The parts a shop uses affect how well your vehicle fits back together, how it holds up in the next collision, and whether the finish still looks right in two years.
At Alamo Collision, we install both OEM and aftermarket parts depending on the job, the vehicle, and what you and your insurance decide. What we won't do is make that choice behind your back. So here's the honest breakdown of what each one is, where each makes sense, and what Texas law actually says about your right to choose.
What "OEM" and "Aftermarket" Actually Mean
These two terms get thrown around like everyone already knows them. Most people don't. Here's the plain version.
Made by (or for) Your Automaker
OEM parts are identical to the ones your vehicle rolled off the assembly line with. They're built to the manufacturer's exact specification — same steel gauge, same mounting points, same crush characteristics, same paint-ready finish. A Ford OEM fender is the same fender Ford installs at the factory. These parts almost always carry a manufacturer warranty.
✓ Exact factory fit and finish
✓ Engineered to work with airbag and ADAS sensor systems
✓ Backed by a manufacturer warranty
Built by Someone Other Than Your Automaker
Aftermarket parts are made by independent companies to fit a range of vehicles. Quality varies widely — some are excellent, some are rough. Because they aren't made to the automaker's original tolerances, fit can be slightly off, the metal can be a different thickness, and mounting holes may not line up perfectly. They're almost always cheaper, which is exactly why insurance companies favor them.
✓ Lower cost — often 20–60% less than OEM
✓ Good option for non-structural, cosmetic pieces
✓ Wide availability, often faster to source
There's also a third category worth knowing: recycled or "LKQ" parts — used OEM parts pulled from salvaged vehicles. These are genuine factory parts, just previously installed. Insurers sometimes specify them for older vehicles to keep repair costs proportional to the car's value.
Side by Side
| Factor | OEM | Aftermarket |
|---|---|---|
| Fit & finish | Exact factory match | Can vary; may need adjustment |
| Cost | Higher | Lower |
| Warranty | Manufacturer-backed | Varies by maker |
| Safety systems | Designed for your exact vehicle | May affect sensor/airbag calibration |
| Availability | Can have longer lead times | Often in stock |
| Resale / value | Preserves vehicle value | May reduce it on newer cars |
When Each One Makes Sense
This isn't a case where one option is always right. The smart answer depends on the part and the vehicle.
Lean OEM for structural and safety parts
Bumper reinforcements, crush zones, frame components, and anything tied to airbag deployment or driver-assistance sensors (ADAS) should be OEM whenever possible. These parts are engineered to absorb and direct crash energy in a specific way. A slightly different aftermarket version can change how your vehicle protects you in the next accident — and can throw off sensor calibration for lane-keep and automatic braking.
Aftermarket is often fine for cosmetic pieces
A bumper cover, a bracket, a trim piece, or a headlight housing on an older vehicle — quality aftermarket parts can do the job at a real savings. On a 10-year-old car, spending OEM money on a cosmetic panel often isn't worth it. This is where a good shop saves you money without cutting a corner that matters.
Newer vehicles usually deserve OEM
If your vehicle is still under manufacturer warranty, or it's late-model with a full suite of safety sensors, OEM parts protect both the warranty and the technology. Many newer trucks and SUVs have cameras and radar behind the grille and bumpers that require precise part geometry to function correctly.
Your Rights Under Texas Law
Here's the part most drivers don't know: in Texas, you choose the parts on your car — not the insurance company. Under Title 28, Section 5.501 of the Texas Administrative Code, your insurer is required to notify you in writing that you have the right to select both the shop that repairs your vehicle and the parts used to do it.
There's a catch worth understanding. The insurance company is only required to pay a reasonable amount for parts and repairs. If their approved estimate is based on aftermarket parts and you want OEM, you have the right to insist on OEM — but you may be responsible for the price difference, unless your policy specifically guarantees OEM parts (some do; it's worth checking).
Watch for "Steering"
The Texas Department of Insurance also protects your right to choose your shop. If an adjuster implies you'll have to pay more or won't be covered unless you use their "preferred" facility, that's called steering — and it may violate Texas rules. You can always choose Alamo Collision, and we'll handle the claim directly with your carrier.
How to Decide — Questions to Ask
Before repairs start, get clear answers to these. They'll tell you exactly what's going on your car and why.
Which parts on the estimate are OEM, aftermarket, or recycled?
Every line-item estimate codes this. A good shop will walk you through it.
Are any of the aftermarket parts structural or safety-related?
If so, that's where you may want to push for OEM even at extra cost.
Does my policy include OEM parts coverage?
Some policies have an OEM endorsement. If yours does, insist on it at no extra charge.
If I pay the difference, how much more is OEM?
Sometimes the gap is small enough that upgrading key parts is an easy call.
Common Questions
Will aftermarket parts void my manufacturer warranty?
Not automatically. A manufacturer can't void your entire warranty just because an aftermarket part was used. But if a specific aftermarket part causes a failure, the repair of that failure may not be covered. On a vehicle still under factory warranty, OEM is the safer route.
Do aftermarket parts affect my car's resale value?
They can, especially on newer or higher-end vehicles. A repair history showing OEM parts reassures a future buyer or appraiser. This ties directly into diminished value — the loss in resale value a vehicle carries after any accident, regardless of repair quality.
Can the shop mix OEM and aftermarket parts on one repair?
Yes, and that's often the smartest approach — OEM for the structural and safety-critical parts, quality aftermarket for cosmetic pieces where it saves you money without any downside. That balance is exactly what a good estimate should reflect.
Who decides in the end — me or the insurer?
You do. Texas law gives you the right to choose the parts used on your vehicle. The insurer controls how much they'll pay, but the final call on what goes on your car is yours.
Straight Talk. Lifetime Warranty.
We'll Show You Every Part Before It Goes On
At Alamo Collision, we walk you through your estimate line by line, explain which parts are OEM versus aftermarket and why, and handle your insurance claim from start to finish. Lifetime warranty on every repair. Serving Alvin, Pearland, Friendswood, Manvel, and greater Houston.
703 E. Hwy 6, Alvin, TX 77511 · Mon–Fri 8am–6pm