Where does an OEM lose parts sales to the aftermarket?
An OEM loses parts sales to the aftermarket wherever finding or ordering its own part is harder than buying a generic substitute, which usually means at the catalog, at the dealer counter, and at the order.
Why does parts revenue leak at all?
Parts revenue leaks because the OEM part is rarely the only option and is often not the easiest one. A trailer brake chamber, an air suspension valve, or a marker lamp can be bought from many suppliers. When a dealer or fleet can identify the OEM part quickly, trust that it fits, and order it in the system they already use, most will buy it. When any of those steps fails, the buyer reaches for whatever part is in stock nearby. Aftermarket parts sales leakage is the sum of those small failures across the installed base, year after year.
Leak one: the part cannot be identified
The first leak is identification. A customer calls with a broken part and no part number. The counter opens a catalog organized by product line, not by the individual unit, and has to guess which brake package, harness, or door hardware the trailer was built with. If the guess takes too long or feels risky, the counter sells a universal part instead. Catalogs that resolve to the specific asset by VIN or serial number, and that let people find a part without a part number, close the largest leak of all.
Leak two: the catalog is out of date
An out-of-date catalog leaks revenue quietly. Engineering changes swap components mid-production, suppliers discontinue parts, and supersessions pile up. When the catalog lists a part that is no longer orderable, or misses the replacement, the dealer either calls the OEM or gives up. After a few bad experiences, the counter stops trusting the catalog and relies on memory and cross-reference books, which tend to point toward non-OEM parts. Keeping the catalog current with engineering changes protects every sale that depends on it.
Leak three: the part is hard to buy online
Thin product content leaks sales on the OEM's own parts store. A listing that shows only a part number and a cryptic description cannot compete with an aftermarket listing that has a clear title, specifications, and images. Buyers searching for a crane hydraulic cylinder seal kit or a fire apparatus pump packing kit choose the listing they can understand. Commerce-ready content, including titles, descriptions, specs, and images, is what lets the OEM part win on the screen. The guide to parts data enrichment covers the work in detail.
Leak four: ordering takes too many steps
Ordering friction leaks the sales that survive identification. A dealer who finds the right part in one portal, then has to re-key it into a separate order screen, then wait for a price and availability callback, has every reason to buy from the distributor down the street. Dealers who carry several OEM lines feel this most, which is why many want one parts system instead of a separate portal per manufacturer. Orders that flow into the dealer's management system or the OEM's ordering keep the sale moving.
How do you find where your own revenue leaks?
You find leaks by comparing what people looked for with what they bought. Searches that end without an order, frequent calls to the OEM parts desk about the same assemblies, and supersessions that dealers keep getting wrong all point to specific gaps. Order history alone cannot show them, because a lost sale leaves no order behind. The guide to what service events tell an OEM explains how search and order data together reveal where demand is going elsewhere.
How does Enduris approach parts revenue leakage?
Enduris closes the gaps where parts sales leak. Dealers and fleets look up any asset by VIN, serial number, or asset tag and see the parts it was actually built with, then find the right part by browsing, describing it in plain language, or snapping a photo. They know what is orderable, with supplier and aftermarket part numbers cross-referenced and replaced parts pointed to the current one. The catalog stays current as engineering changes happen, part content is ready for the OEM's online store, and orders flow into existing systems. OEMs see what dealers and fleets search for and order, so they can act on lost demand.
Common questions
Why do dealers sell aftermarket parts instead of OEM parts?
Usually because the aftermarket part is easier to identify, in stock nearby, or faster to order. Price matters, but speed and confidence at the counter often matter more.
Does cross-referencing aftermarket part numbers help or hurt the OEM?
Cross-referencing helps. When a dealer searches by a supplier or aftermarket number, a catalog that maps that number to the OEM part keeps the sale in the OEM channel instead of sending the buyer elsewhere.
Is leakage mostly a pricing problem?
Rarely on its own. Most leakage comes from the part being hard to find, hard to trust, or hard to order, and those problems are fixed in the catalog and the ordering flow rather than the price list.