When purchasing spare parts for a car, you have probably come across the terms "original", "analogue" and OEM. The latter often raises the most questions: what is hidden behind this abbreviation, why can parts with an OEM number cost less than the original ones, but not be inferior in quality? And most importantly - how not to run into a fake when choosing a spare part according to the code?

In this article we will look at what it is OEM part number, how it differs from the factory article number of the car manufacturer, where to look for it and how to use it correctly when searching for parts. You'll learn why some OEM parts can be even better than "original" (yes, that happens!), and you'll also receive a checklist to verify the authenticity of the part before you buy.

Arguing about which is better - original spare parts, OEM or analogues - you can endlessly. But the facts remain facts: about 70% of car owners have at least once purchased parts with OEM markings, without even knowing it. The fact is that many car manufacturers do not produce components themselves, but order them from third-party companies. It is these companies that assign parts OEM numbers — unique identifiers by which you can find the same spare part, but without the automaker’s logo and with a different price.

But herein lies the main pitfall: not all OEM parts are created equal. Some are made in the same factories as the “originals,” while others are made in third-party facilities with less quality control. How not to make a mistake? Let's sort it out in order.

What does the OEM part number mean - explanation of the term

OEM (from English Original Equipment Manufacturer) is literally translated as "original equipment manufacturer". In the context of auto parts, this means that the part was manufactured by a company that supplies components directly to the assembly line of an automobile plant.

For example, when Volkswagen releases a new model Golf, it does not make all the parts in-house, from spark plugs to brake pads. Instead, the concern orders them from specialized suppliers, such as Bosch, TRW or Mahle. These companies are OEMs.

It is important to understand that OEM number - this is an internal article of the supplier company, not the car brand. That is, the same part can have:

  • 🔧 Original number (for example, from Toyota — 44302-02090 for oil filter)
  • 🏭 OEM number (from the manufacturer Denso — 150-1005 for the same filter)
  • 🔄 Analogue number (from a third party brand, e.g. Mann — W 610/3)

The key difference between OEM and the original: the part is identical in design and materials, but is sold without the automaker’s packaging and is often 20–50% cheaper. At the same time, the quality can be even higher - some OEM suppliers use simplified versions of parts for the conveyor, and produce enhanced modifications for retail sale.

📊 How often do you buy spare parts with OEM numbers?
Never heard of OEM
Sometimes, if cheaper than the original
Always looking for OEM as an alternative
I prefer only original parts

OEM vs original vs analogue: what is the difference in practice

In order not to get confused in terms, let's compare the three types of spare parts using a specific example. Let's say you need to replace brake pads on Ford Focus 3.

Part type Manufacturer Part number Price (example) Features
Original Ford 1880497 4 500 ₽ Packaging with logo Ford, dealer guarantee, highest price
OEM TRW (supplier for Ford) GDB1449 2 800 ₽ The same pads, but without the brand Ford. May be better in terms of friction material composition
Analogue Ferodo FDB1449 2 200 ₽ Own development Ferodo, may differ in characteristics

At first glance, an OEM part is the gold standard: the same part, but cheaper. However, there are nuances:

  • ⚠️ Not all OEM suppliers are the same. For example, Bosch and Denso are known for high quality, and little-known Asian companies can save on materials.
  • 🔍 Original ≠ best quality. Sometimes automakers order “lighter” versions of parts from OEM suppliers to save money, and the same companies sell reinforced versions at retail.
  • 💰 Price is not always objective. An original spare part may cost more only because of the logo on the package and the dealer's markup.

When should you choose OEM?

⚠️ Attention: If you are buying a safety part (brakes, airbags, steering), it is better to choose trusted OEM brands or the original. Saving on pads or timing belt can result in an accident.

Where to look for the OEM number of a spare part for your car

There are several ways to find the OEM part number. The most reliable way is to look at the spare part itself (if it has not yet been removed from the car) or in the documentation for the car. However, this information is often hidden. Here are alternative methods:

1. By car VIN code

Services like Autodoc, Exist.ru or Emex allow you to enter the VIN and get a list of original and OEM numbers for your model. Example path: Catalog → Search by VIN → Code entry → Select a unit (for example, “Brake system”) → List of parts with numbers

2. By original number

If you know the part number from the car manufacturer (for example, 31126770376 for oil filter BMW), it can be entered into the cross-number database (for example, TECDOC or AutoCat). The system will show all compatible OEM analogues.

3. On the part itself

Many spare parts have a number stamped or pasted on them. For example, on a generator Bosch for Renault you can find markings like 0 124 520 015 - this is the OEM number.

4. Through electronic catalogs of manufacturers

Large OEM suppliers (e.g. ZF, Sachs, Hella) have their own online catalogs where you can select a part based on your car model.

Check the part number with the database (TECDOC, Autodoc)

Check the packaging for holograms and protective stickers

Evaluate the quality of casting/material (no burrs, rust, poor-quality painting)

Ask the seller for a certificate of conformity (for critical parts) -->

How to decipher the OEM part number

Unlike original vehicle manufacturer's plates, OEM codes do not have a uniform standard. Each company uses its own notation system. However, there are general principles:

1. Number structure

Typically the OEM number consists of:

  • 🔢 Prefix (manufacturer code, e.g. 0 124 at Bosch)
  • 📌 Main part (unique part identifier, e.g. 520 015)
  • 🔤 Suffix (additional symbols for modifications, e.g. /HD for "heavy mode")

2. Transcription examples

Brand Example number Decoding
Bosch 0 986 452 017 0 - automobile parts, 986 - series, 452 017 - unique ID
Denso K20TT K - spark plugs, 20 - heat number, TT — twin-tip (double electrode)
ZF 5-24-3210-01 5-24 - a series of shock absorbers, 3210-01 - model

3. How to avoid counterfeits

Counterfeit OEM parts often have numbers that differ by 1-2 characters. Always check the code with official catalogs! For example, the original number Mahle for filter OC 205, and scammers can sell a fake number OC 205A.

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If you are purchasing an OEM part from a salvage unit, ask the seller to show the deregistration document for the donor vehicle. This will reduce the risk of running into counterfeit goods.

Top 5 Myths About OEM Parts You Shouldn't Believe

There are a lot of rumors surrounding OEM parts. Let's look at the most common misconceptions:

Myth 1: "OEM is the same as the original"

❌ Reality: The original spare part undergoes additional quality control at the automaker's plant, but the OEM does not. Sometimes this results in the OEM part being better (for example, when the supplier uses more durable materials for retail sales).

Myth 2: “All OEM parts are cheaper than original ones”

❌ Reality: Some OEM components (for example, turbines Garrett or clutch Sachs) may cost more than original ones due to the use of premium materials.

Myth 3: "OEM is only suitable for older cars"

❌ Reality: Even for the newest models (eg. Tesla Model 3 2023) there are OEM analogues from suppliers like Brembo or Magna.

Myth 4: “Analogs are always worse than OEM”

❌ Reality: Some brands (eg Febi or Meyle) specialize in improved versions of original parts. Their analogues may outperform OEM in terms of service life.

Myth 5: "OEM numbers are universal for all markets"

❌ Reality: The same car can be equipped with different parts for Europe, Asia or the USA. For example, Toyota Corolla for Japan it comes with different shock absorbers than for Russia. Always check your region!

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An OEM part is not always identical to the original one. Sometimes this is an improved version, and sometimes it is a simplified version (for example, for budget car modifications).

Where to buy OEM parts: trusted sources

Not all stores and platforms are equally reliable. Here's where to look for OEM parts so as not to run into fakes:

  • 🏢 Official dealers of OEM brands (for example, shops Bosch, ZF, Denso). There is minimal risk of counterfeit, but prices may be higher than those offered by resellers.
  • 🌍 Large online platforms:
    • Autodoc (there is a filter by OEM numbers)
    • Exist.ru (checks suppliers)
    • Emex (specializes in commercial vehicles)
  • 🔧 Certified service stations. Many service stations order OEM parts in bulk and sell them at a small markup.
  • ♻️ Showdown (only if there is a guarantee of authenticity!). At some showdowns (for example, Bamper.by) you can find original parts with OEM numbers from official suppliers.
⚠️ Attention: Avoid shopping on Avito, OLX or in small unverified stores without reviews. The risk of running into a counterfeit OEM brand here reaches 40%.
How to distinguish a counterfeit OEM part from an original one?

Fakes often have:

- Numbers with typos (for example, BOSH instead of BOSCH)

- Uneven casting seams or traces of rough processing

- Packaging without holograms and protective stickers

- Lack of certificates (for critical parts like timing belts)

Genuine OEM parts are always clearly marked, often with a QR code for verification.

Practical Tips: How to Save on OEM Parts

Purchasing OEM parts can save up to 50% of your repair budget if done wisely. Here are some proven life hacks:

1. Look for "off-the-shelf" parts

Some OEM components are used in multiple vehicle models. For example, a generator Valeo with number 584052 suitable for Peugeot 308, Citroen C4 and Renault Megane. The wider the application, the cheaper the part.

2. Buy in sets

Many OEM suppliers sell parts kits at a discount. For example, clutch kit Sachs (disc + basket + releaser) will cost less than buying everything separately.

3. Follow promotions from official dealers

Companies like Bosch or Mahle They regularly hold sales on their websites. Subscribe to their newsletters so you don't miss out on discounts.

4. Check cross numbers

The same part may be sold under different part numbers by different suppliers. For example, filter Mann W 712/94 completely identical Mahle OC 693/3, but may cost 20% less.

5. Don't go for "premium" OEM

Sometimes parts from lesser-known but certified suppliers are no worse than those from giants like Bosch. For example, Blue Print (group brand AD) offers high-quality OEM analogues at prices 15–25% lower.

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If you are buying an OEM part for a foreign car, check what market it is intended for. For example, Japanese versions are often of better quality than European ones due to stricter reliability requirements.

FAQ: Frequently asked questions about OEM part numbers

Is it possible to install an OEM part instead of an original one without voiding the car's warranty?

Yes, but with reservations. According to the Law “On the Protection of Consumer Rights” (Article 18), the dealer does not have the right to refuse warranty repairs only because of the use of non-original parts, if they meet the manufacturer's technical requirements. However, in practice, dealers can complicate the process. To avoid problems:

  • Please keep your receipt and certificate for the OEM part.
  • Install the part at a certified service center (not at a “garage” service station).
  • Make sure the part number is listed in the vehicle manufacturer's catalog as compatible.

If the dealer refuses the warranty, request a written refusal with justification - this will help you challenge the decision in court.

How do I find out who the OEM supplier is for my car brand?

There are several ways:

  1. Look at the part itself - often the supplier’s logo is indicated there (for example, Valeo on a generator or ZF on the shock absorber).
  2. Use databases like TECDOC or AutoCat, which lists the suppliers for each model.
  3. Google a query like "[car make] OEM suppliers list". For example, for BMW main suppliers - Mahle, Bosch, Hella.
  4. Ask on specialized forums (for example, Drive2 or Club-Toyota.ru).

For example: the main OEM suppliers for Volkswagen Group — TRW (brakes), Siemens (electronics), Behr (cooling systems).

What should I do if the OEM number does not match the catalog, but the part is externally identical?

This situation occurs when:

  • The manufacturer updated the part, but maintained compatibility (for example, changed the seal material).
  • The part is universal and fits several models, but the catalog is not for your car.
  • An error in the catalog database (happens even for large services).

What to do:

  1. Compare physical dimensions and characteristics (for example, for filters, throughput).
  2. Check to see if there is an updated version of the part (often a suffix is added to the part number, e.g. -01 or Rev.2).
  3. Contact the OEM brand's technical support (most have online chat or email).

If in doubt, don't take risks. For example, inappropriate oil pump may damage the engine.

Why can the same OEM part cost different things in different stores?

The price depends on several factors:

  • Logistics: a part brought directly from the manufacturer is cheaper than one that was in the intermediary’s warehouse.
  • Packing: some shops repack OEM parts in their boxes, which adds 10-15% to the price.
  • Warranty: Stores that offer an extended warranty (for example, 2 years instead of 1) may include this in the price.
  • Region: parts for the European market are often more expensive than Asian counterparts due to different standards.
  • Promotions: large venues like Autodoc may sell parts at cost to attract customers.

Tip: If the price difference is more than 20%, check if it is a fake. Too low a price is a reason to be wary.

Is it possible to find a part for a rare or old car using the OEM number?

Yes, and this is one of the main advantages of OEM numbers! Many parts for retro cars (for example, Volga GAZ-24 or Moskvich 412) have not been produced under original numbers for a long time, but their OEM analogues are still produced.

Where to look:

  • Specialized directories (for example, OldTimerCatalog for classics).
  • Forums for owners of rare models (compatibility tables are often posted there).
  • Commercial vehicle parts stores (many truck parts fit older cars).

Example: for GAZ-66 Wheel bearings can be found by OEM numbers SKF or FAG, which are still produced for agricultural machinery.