Different Types Of Auto Parts: Genuine, OEM, Aftermarket

- How to Distinguish Types of Auto Parts: Genuine, OEM, Aftermarket
Latest update date: February 05, 07

In the ever-evolving world of the auto industry, distinguishing between different types of car parts has become an important skill for both car owners and technicians. The auto parts market today includes many diverse categories, from genuine parts (OEM) produced by manufacturers such as Toyota, Ford or Honda, to replacement parts (aftermarket) to from brands like Bosch, Denso or NGK.

Besides, there are also remanufactured spare parts, used spare parts, and even counterfeit spare parts circulating on the market. Each type of spare part has its own characteristics in terms of quality, price, and compatibility, requiring users to have knowledge and sophistication in recognition.

In addition, the development of technology such as QR codes and mobile applications is also helping consumers easily verify the origin and authenticity of spare parts. However, challenges still remain as counterfeit products become increasingly sophisticated, requiring high vigilance from buyers.

This article will help you differentiate between genuine, OEM, and aftermarket parts, providing detailed information to help you make informed decisions when maintaining or repairing your vehicle.

Genuine auto spare parts
Genuine auto parts

Overview of the Auto Parts Market

According to a report by Grand View Research, the global auto parts market is worth $376,11 billion by 2023 and is expected to grow at a CAGR of 3,4% from 2024 to 2030. This diversity poses a challenge for consumers in choosing suitable spare parts.

1. Genuine Parts (Genuine Parts)

Genuine parts are parts manufactured or distributed by the automobile manufacturer (OEM) and carry their brand.


  • Highest quality, guaranteed 100% vehicle compatibility
  • Price is higher than other spare parts
  • Usually there is a warranty from the manufacturer

For example: A genuine Toyota oil filter costs about 150.000 - 200.000 VND, while the OEM version can be only about 100.000 - 130.000 VND.

2. OEM spare parts (Original Equipment Manufacturer)

OEM parts are manufactured by the same companies that supply the automakers, but are sold under their own brand.

Important features:

  • The quality is equivalent or close to genuine spare parts
  • Prices are usually 20-30% lower than genuine products
  • Diverse in origin and manufacturer

Comparison table of some famous OEM manufacturers:

Producer Specialize Applicable vehicle brand
Bosch Electrical system, fuel injection Most car companies
Denso Spark plugs, cooling system Toyota, Honda, Nissan
Continental Tires, brake system BMW, Mercedes Benz
Aisin Gearbox, water pump Toyota, Lexus

3. Aftermarket spare parts

Aftermarket parts are parts manufactured by independent companies, not directly related to the automaker.

Main features:

  • Price is much lower than genuine and OEM products
  • Quality can range from poor to OEM equivalent
  • Diverse in designs and features, can be improved compared to the original

Note: According to a study by the Automotive Aftermarket Suppliers Association (AASA), the aftermarket parts market in the US will reach a value of 332 billion USD by 2022, showing the popularity of this type of parts.

- How to Distinguish Types of Auto Parts: Genuine, OEM, Aftermarket
Diversity in types and quality.

Parts Selection Criteria

4 criteria to help choose the best auto parts:

  • Vehicle age and condition: New vehicles should prioritize genuine or high-quality OEM parts.
  • Budget: Consider cost and desired quality.
  • Intended use: Frequently used vehicles need higher quality spare parts.
  • Warranty: Check the warranty policy of each spare part.

Top OEM and OES Brands


  • Bosch: Provides more than 50,000 types of spare parts for most car manufacturers
  • Continental: Specializing in tires and braking systems, 2022 revenue reaches 39,4 billion Euros
  • ZF Friedrichshafen: Gearboxes and drive systems, revenue 43,8 billion Euros (2022)


  • Denso: Revenue of 5,4 trillion yen (2022), supplying most Japanese car manufacturers
  • Aisin Seiki: Specializing in transmissions and car body components, revenue 3,9 trillion yen (2022)
  • Hyundai Mobis: Largest supplier for Hyundai and Kia, revenue 41,7 billion USD (2022)

Choosing auto parts requires careful consideration between quality, price and intended use. While genuine spare parts ensure the best quality, OEM and aftermarket also provide many options to suit users' diverse budgets and needs.

By understanding the types of parts and their characteristics, you can make informed decisions, ensuring safety and optimal performance for your vehicle. Always consult with experts and read the specifications carefully before deciding to purchase any spare parts.

What is Aftermarket Parts
Note when choosing to buy genuine auto parts

Where to Buy Genuine Auto Parts, Good Prices?

We do not trust in imitation or copy products and market products, we always encourage customers to focus on OEM, OES OEM products, in case of necessity, it is genuine. We advise customers towards the suitability in price and quality of use. Usually, OEM products are 20% - 30% lower than the genuine ones, depending on the parts used for the machine - undercarriage or electric - and have equivalent quality.

We have researched the best brands for each part of the vehicle and offer only brands that meet our stringent quality.

We also believe in choice for our customers. A lot of spare parts are available in both OEM and OES brands at a different cost, which gives you a choice of parts that better suit your requirements.

Frequently Asked Questions (FAQ)

1. What is OES spare parts and how is it different from OEM?

OES (Original Equipment Supplier) are spare parts manufactured by suppliers to automakers, but sold directly on the spare parts market. OES often has the same quality as OEM but can cost 5-10% less because it does not have to bear the packaging and distribution costs of the automaker.

2. How to identify genuine spare parts?

Genuine parts usually have the vehicle manufacturer's logo, specific part numbers, and are packaged in boxes with official labels. In addition, they are often sold at authorized dealers and are priced about 30-50% higher than other spare parts.

3. Is there a quality difference between OEM parts from different manufacturing regions?

There may be slight differences. For example, OEM parts made in Japan are often appreciated for their durability and precision, while OEM parts from China may have a price 10-15% lower but the quality is sometimes inconsistent.

4. What risks are there when using aftermarket parts?

Key risks include:

  • Uneven quality (15-20% may have problems)
  • Poor compatibility (5-10% of cases)
  • Effects on vehicle performance (3-5% reduction in some cases)
  • May affect vehicle warranty (30% of dealers may refuse warranty)

5. Is there a price difference between spare parts for economy cars and luxury cars?

Yes, the difference can be significant:

  • Popular cars: Genuine spare parts prices are 20-30% higher than OEM
  • Luxury cars: Genuine parts prices can be 50-100% or more higher than OEM

6. How to distinguish high and low quality OEM spare parts?

Check the origin of production (prioritize countries with high technology such as Germany, Japan, America)

  • Consider quality certification (ISO 9001, IATF 16949)
  • Compare weight and material feel with genuine parts
  • Check reviews from reputable garages and professional auto forums

7. How to optimize costs when buying auto parts?

Ways to optimize costs when buying auto parts include:

  • Prioritize OEM spare parts for critical components (engine, brake system)
  • Use high quality aftermarket parts for less critical parts
  • Buy from reputable distributors to get 10-15% better prices
  • Participate in dealer promotions (can save 5-20%)
  • Consider using remanufactured parts for old cars (save 30-50% compared to new)

See the newspaper now Genuine auto parts replacement prices, the most prestigious in HCM and highly appreciated by many car owners today.

8. What is the impact of using non-genuine parts on car insurance?

Using non-genuine spare parts can:

  • Increase insurance premiums by 5-10% due to higher risk
  • Reduce compensation rate to 70-80% of actual value
  • In some cases, it may lead to denial of compensation (2-5% of cases)

9. Is there a difference in quality of spare parts between car manufacturers?

Yes, but the difference is usually not too big between car brands in the same segment:

  • Japanese cars: High durability, average price
  • German cars: High quality, 15-25% higher price
  • Korean cars: Rapid improvement in quality, competitive prices
  • Chinese cars: Quality is improving, prices are 20-30% lower

This difference reflects the design philosophy and market strategy of each car company.

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