Genuine, OEM, OE and Aftermarket Land Rover Parts Explained
Genuine, OEM, OE and Replacement Parts Explained
Genuine, OEM, OE, direct replacement, pattern and aftermarket are terms used throughout the motor trade, but they do not all mean the same thing. This guide explains the differences so you can understand what you are buying and choose the most suitable part for your Land Rover.
Why can the same-looking part have several descriptions?
Vehicle manufacturers do not normally manufacture every individual component fitted to a vehicle. Many parts are designed, developed or produced by specialist component manufacturers working to an agreed specification.
That same manufacturer may supply parts to the vehicle production line, produce boxed replacement parts for the vehicle manufacturer and sell similar or equivalent components through the independent parts market.
The differences may therefore relate to the supply route, packaging, branding, specification, warranty and price rather than simply who physically manufactured the component.
The main parts classifications
These are the descriptions you are most likely to see when shopping for replacement, repair, service or maintenance parts.
Genuine Land Rover
A Genuine Land Rover part is supplied through the official Land Rover parts system and normally carries Land Rover branded packaging and an official Land Rover part number.
The part may have been manufactured by Land Rover or, more commonly, by one of the specialist manufacturers contracted to produce components for its vehicles. Genuine therefore describes the official supply route and branding, not necessarily the factory that physically made the part.
OEM
OEM stands for Original Equipment Manufacturer. An OEM part is supplied by a manufacturer that produces original equipment for vehicle manufacturers.
In many cases, the OEM company also manufactured the original component fitted to the vehicle or supplied the equivalent part through the vehicle manufacturer's official parts network.
An OEM part can therefore provide excellent quality without the cost associated with vehicle manufacturer branded packaging. However, OEM should not be assumed to mean that every part is completely identical to the Genuine boxed version.
OE
OE stands for Original Equipment. It generally describes a part, brand or specification connected with the components originally used during vehicle production.
The term may be used for the original component itself, a part made to an original equipment specification or a part supplied by a recognised original equipment manufacturer.
Because the term is sometimes used broadly within the motor trade, the full product description should be checked rather than relying on the letters "OE" alone.
Direct Replacement
Direct Replacement is a term we use for independently supplied replacement parts designed to replace the original component and perform the same intended function.
In practical terms, Direct Replacement sits within the same broad category as aftermarket or pattern parts. These terms are often used differently by parts manufacturers and suppliers, but all generally describe replacement components supplied outside the vehicle manufacturer's Genuine or OEM parts network.
The term Direct Replacement should not be taken to indicate a higher or lower quality level than a part described as aftermarket or pattern. As with any replacement component, quality depends on the manufacturer, specification, materials and quality control behind the individual product.
Pattern Part
Pattern part is a traditional motor trade term for an independently manufactured replacement component designed for the same application as the original part.
The term overlaps considerably with aftermarket and Direct Replacement. It does not, by itself, indicate a particular level of quality or suggest that the part is inferior to another type of independently supplied replacement.
As with all replacement parts, quality can vary between manufacturers and product ranges. The brand, specification, materials and supplier's quality controls are therefore more useful indicators than the term "pattern" alone.
Aftermarket
Aftermarket is the broad term used for replacement parts supplied outside the vehicle manufacturer's official Genuine parts network.
It covers a huge range of products, including established international brands, specialist manufacturers, performance components and independently manufactured replacement parts. Terms such as Direct Replacement and Pattern Part generally fall within this wider aftermarket category.
Aftermarket does not indicate a particular quality level. Some aftermarket components may equal or improve upon the original design, while others are developed to provide a more economical replacement. The individual manufacturer and product specification are the important factors.
The relationship between Genuine and OEM parts
Genuine and OEM parts can be closely related, but the terms are not interchangeable.
Genuine supply route
The vehicle manufacturer commissions or approves a component and supplies it through its official parts network in branded packaging, normally under its own part number.
OEM supply route
The component manufacturer supplies a product through the independent parts market under its own name, in neutral packaging or through a specialist automotive parts distributor.
The two parts may come from the same manufacturer and may be visually identical, but packaging, markings, included fittings, production date, warranty route or detailed specification can differ. Unless confirmed, it should not automatically be assumed that every OEM-listed product is precisely the same as the current Genuine boxed component.
Why might an OEM part arrive in plain or different packaging?
Packaging is part of the supply chain and does not always identify the company that manufactured the component.
Bulk purchasing
Parts suppliers may purchase large quantities directly from a manufacturer in bulk cartons, trays or industrial packaging rather than individual retail boxes.
Supplier repackaging
Bulk components may be individually repackaged by the distributor or wholesaler to protect them in storage and make them suitable for individual sale.
Neutral packaging
Some OEM products are intentionally supplied in plain, neutral or distributor branded packaging because they are being sold outside the vehicle manufacturer's official network.
Why might a name, logo or number be removed from the part?
In some cases, a component manufactured by an original equipment supplier may have a vehicle manufacturer's trademark, logo or protected part number removed, ground off, covered or otherwise obscured before it can be sold through the independent aftermarket. This can be required by contractual, trademark, licensing or supply agreements between the component manufacturer and the vehicle manufacturer. The removal of a protected marking does not necessarily mean the component is faulty or counterfeit, although the product should still be purchased from a reputable source.
Other parts descriptions you may see
Some components fall into more specialised categories depending on how they are manufactured, supplied or intended to be used.
OES or Original Equipment Supplier
This usually refers to a company known to supply components to vehicle manufacturers. It is similar to OEM terminology, although its use can vary between suppliers and product listings.
Branded Aftermarket
A replacement component sold under an identifiable and established parts brand. The manufacturer may not have supplied the original vehicle production line, but the product is supported by a recognised brand and defined warranty.
Unbranded Aftermarket
A replacement part sold without a clearly identified component manufacturer. This does not automatically make it unsuitable, but there may be less information available about its origin or specification.
Remanufactured
A previously used component that has been dismantled, cleaned, inspected and rebuilt. Worn parts are replaced as necessary and the completed unit is tested against a defined standard.
Reconditioned
A used part that has been repaired or restored to working condition. The amount of work completed can vary, so the supplier's process and warranty should be checked.
Service Exchange
A replacement remanufactured or reconditioned unit supplied on the condition that the old component is returned. A refundable surcharge may be charged until the acceptable old unit is received.
New Old Stock
An unused component manufactured some time ago and retained in storage. It may be original specification, but age-related deterioration should be considered for rubber, seals, adhesives and other perishable materials.
Uprated or Performance
A component designed to change or improve a feature such as strength, cooling, suspension control, ground clearance or off-road performance. Uprated does not necessarily mean it is the best choice for every standard road vehicle.
Quick comparison
The table below provides a general guide. Individual products can vary, so always use the specific listing as the final description of the part being supplied.
| Part type | Typical supply route | Typical packaging | What the term tells you | What it does not guarantee |
|---|---|---|---|---|
| Genuine Land Rover | Official vehicle manufacturer parts network | Usually Land Rover branded | Officially supplied and branded component | That Land Rover physically manufactured it |
| OEM | Original equipment manufacturer or specialist distributor | Manufacturer, supplier or plain packaging | Connection with an original equipment manufacturer | That it is always identical to the Genuine boxed part |
| OE | Varies | Varies | A claimed connection with original equipment or specification | A precise supply route unless further explained |
| Direct Replacement | Independent parts market | Manufacturer, distributor or plain packaging | A replacement component intended for the same application as the original | A particular manufacturer or quality level |
| Pattern Part | Independent parts market | Manufacturer, distributor or plain packaging | A traditional term for an independently supplied replacement component | A particular manufacturer or quality level |
| Aftermarket | Independent parts market | Branded, distributor or plain packaging | A broad category for parts supplied outside the Genuine parts network | A particular manufacturer or quality level |
Which type of part should you choose?
There is no single answer for every vehicle, component or budget. The right choice depends on the importance of the part, how the vehicle is used and how long you intend to keep it.
For official specification and branding
A Genuine part may be the preferred choice when exact official supply, branding, presentation or manufacturer-controlled specification is especially important.
For quality and value
A clearly identified OEM or reputable branded aftermarket component often provides an excellent balance between quality, availability and cost.
For an economical repair
A suitable Direct Replacement, pattern or aftermarket component can provide a practical and cost-effective repair, whether the vehicle is newer or older. The best choice depends on the individual brand, specification, application and budget rather than the terminology alone.
Frequently asked questions
Is an OEM part the same as a Genuine Land Rover part?
It may have been produced by the same component manufacturer and may appear identical, but it is supplied through a different route. Packaging, markings, included fittings, warranty and detailed specification can differ. Unless it has been confirmed for that particular product, the two should not automatically be treated as completely identical.
Why has my OEM part arrived in a plain box or plastic bag?
Component manufacturers often supply wholesalers in bulk rather than in individual retail packaging. The parts may then be individually packed by the distributor or supplier. Plain packaging does not, by itself, mean the component is not OEM.
Why has a logo or part number been ground off?
A component may originally have been manufactured using tooling that includes a protected vehicle manufacturer logo or number. Contractual, trademark or licensing restrictions may require that marking to be removed or obscured before the component is sold independently.
Does aftermarket mean poor quality?
No. Aftermarket is a broad description for parts sold outside the official vehicle manufacturer network. It includes respected global manufacturers, specialist upgrade brands and economical replacement ranges. Quality should be judged using the stated brand, specification, application and supplier.
Is a pattern part always inferior?
No. Pattern Part is simply one of the terms commonly used for independently supplied replacement components. It does not, by itself, indicate a particular quality level. The manufacturer, specification, materials and supplier are more useful indicators of the quality of an individual part.
What does Direct Replacement mean?
Direct Replacement is the term we use for independently supplied replacement parts intended to replace the original component and perform the same function. It sits within the same broad category as aftermarket and pattern parts and does not, by itself, indicate a higher or lower level of quality.
This guide explains terminology commonly used within the automotive parts industry. Descriptions can vary between manufacturers and suppliers, and the individual product listing should always be used to confirm the part being offered. Land Rover and associated model names are trademarks of their respective owners and are used for identification and compatibility purposes only. JGS4x4 Ltd is an independent parts retailer and is not affiliated with or endorsed by Jaguar Land Rover Limited.