In the automotive aftermarket, margin concentrates in branded aftermarket parts sold through the independent repair channel, not in OEM parts or in dealership service. OEM parts trade on trust at thin margin, branded aftermarket competes on engineering at wider margin, and counterfeit or grey-market parts undercut both by skipping the cost the margin is paying for.
Where does the margin actually sit?
Three tiers sell into the same repair job and none of them compete on the same terms. OEM parts, sold through the dealership, carry the manufacturer's brand and a warranty tail, which buys trust but leaves little room for markup once the dealer, distributor and manufacturer have each taken a cut. Branded aftermarket parts, sold by companies that never built the original car, compete on engineering and fit rather than badge, and that is where the margin actually concentrates, because the buyer is paying for a part that performs like OEM without the OEM name attached to the invoice.
Grey-market and counterfeit parts undercut both by skipping the testing, warranty reserve and brand-building spend that the other two tiers are pricing in. That is not a smaller margin business, it is a different business, and conflating the three when sizing the category is the most common mistake in how outsiders read it.
The mistake matters because it changes where an investor or a supplier should be looking for growth. A market sized as one blended number hides the fact that branded aftermarket volume can be gaining share of the repair job even while total parts revenue looks flat, simply because a branded part is replacing a cheaper OEM or grey-market unit at a higher price point without any change in the number of cars being repaired.
- 01
Separate the three tiers
Size OEM, branded aftermarket and grey-market or counterfeit parts as distinct businesses, not one blended category.
- 02
Track fleet age, not new sales
Use vehicle age distribution as the demand driver, since it predicts repair volume better than new-vehicle registrations.
- 03
Map the channel split
Follow how a part moves from distributor to independent shop versus dealer, since that path decides who captures margin.
- 04
Watch right-to-repair status
Track diagnostic-data access rules by region, since they set the ceiling on what independents can service.
Why is vehicle longevity expanding the pool?
A car built today is designed to run well past the point where a decade ago it would have been scrapped, and that shift moves the center of gravity of the entire industry. New-vehicle sales create the installed base, but the aftermarket lives on the installed base already on the road, and a fleet that ages further before replacement spends more of its life in the repair-and-maintenance window rather than under factory warranty.
That window is where the aftermarket earns its keep, because factory warranty work routes back to the dealer almost by default, while everything after it is contestable. A longer average vehicle age does not just add years, it adds repair events per vehicle, and each one is a fresh decision about which of the three tiers described above gets the sale.
This is also why the aftermarket is comparatively resilient when new-vehicle sales slow. A recession that delays purchase decisions does not remove cars from the road, it extends the average age of the fleet further and pushes more vehicles into exactly the repair-heavy years the aftermarket depends on, which is the opposite of how a demand shock usually behaves in a durable-goods category.
How does the independent shop and dealer split work?
Independent repair shops handle the bulk of out-of-warranty work, and they do it because they are usually cheaper and closer than the dealership, not because car owners have a strong preference either way. Dealerships hold the warranty period almost by design, since warranty terms typically require dealer service to stay valid, and they compete hardest for the newer, more profitable end of the vehicle-age curve.
Once a car ages out of warranty, the channel decision reopens, and it tends to move toward independents because the labor rate is lower and the parts sourcing is more flexible. That flexibility is exactly what makes distribution the choke point in the whole system. Nextyn runs channel and distributor field research across automotive aftermarket categories because the shop's parts-sourcing decision, not the manufacturer's list price, is usually what determines who actually wins the margin.
The split is not static either. Dealerships have been pushing harder into out-of-warranty service in recent years, offering maintenance packages and loyalty pricing aimed at keeping a customer past the warranty cliff, and some independents have responded by specializing in specific makes or systems rather than competing on being generalists. Reading the channel split as a fixed two-way division misses how much of the competitive pressure now runs between segments within each side, not just across the dealer-independent line.
| Independent shop | Dealership | |
|---|---|---|
| Typical vehicle age served | Out-of-warranty, older fleet | In-warranty, newer fleet |
| Parts sourcing | Flexible, multiple tiers | OEM parts by default |
| Main constraint | Diagnostic data access | Higher labor and parts cost |
How much of the market is counterfeit or grey-market?
Enough to matter and not enough to be the main story. Counterfeit parts cluster around high-turnover, easy-to-fake items such as brake pads, filters and body panels, where the part is simple to copy and the failure mode is not always obvious to the installer. Grey-market parts are a separate, mostly legal problem: genuine parts diverted from one region's distribution into another, which undercuts the authorized distributor's pricing without any quality issue at all.
Distributors and branded manufacturers spend real money fighting both, less because either category is enormous and more because grey-market and counterfeit volume erodes the pricing discipline that the branded aftermarket tier depends on. A market where any buyer can find a cheaper unauthorized version of the same part number is a market where the branded tier's margin comes under constant pressure, which is why enforcement spend tracks the health of the legitimate channel more closely than it tracks the size of the counterfeit problem itself.
The exposure also varies sharply by geography and part type, which is easy to lose in a single global figure. Safety-critical categories in tightly regulated markets tend to see less counterfeit penetration because certification requirements raise the cost of faking a part convincingly, while cosmetic and low-scrutiny parts in less regulated markets see more, since the buyer has fewer ways to tell the difference before installation.
What is right-to-repair actually changing?
Right-to-repair rules are aimed at a narrower target than the name suggests: access to the diagnostic data and repair information that modern, software-heavy vehicles increasingly gate behind manufacturer systems. Without that access, an independent shop can replace a part correctly and still fail to get the car running, because a sensor or module needs to be recalibrated through a manufacturer tool the shop cannot legally or technically reach.
Where right-to-repair rules pass, they tend to preserve the independent channel's ability to compete on newer vehicles, which matters because the newer end of the fleet is exactly where those vehicles are becoming more software-dependent and harder to service without that data. Where they stall, the practical effect is a slow narrowing of the independent shop's addressable work toward older vehicles. That is the same distribution and channel dynamic discussed earlier in how industrial distribution channels consolidate, playing out one repair bay at a time.
Manufacturers frame data access as a safety and liability issue, and there is a real version of that argument, since a botched calibration on a driver-assistance system is not the same category of mistake as a botched belt replacement. But the practical effect of restricted access, intentional or not, is to push a growing share of the newest and most profitable repair work back toward the dealership, which is exactly the outcome an independent-favoring rule is designed to prevent.