OEM Vs. Aftermarket Parts: Know the Difference

Author: Jeo George•Published on: 1/2/2026•5 Minutes
Overview:The difference between OEM and aftermarket spare parts is like chalk and cheese. They both might appear the same, but are fundamentally different in various aspects. When it comes to replacing a faulty or worn-out spare part, you, as a car owner, can often face the dilemma of choosing between an OEM and an aftermarket spare part. Both OEM and aftermarket spare parts have their own sets of pros and cons, but it is crucial to know which of these two types of spare parts is more suitable for your choice of preference. Is budget the only differentiator between them? Well, there’s more to the story, and that’s the detailed difference between these two, which we'll be discussing here.
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Key Highlights:


  • OEM spare parts are more expensive due to their better quality and performance standards.
  • Unlike OEM spare parts, which have limited availability, aftermarket spare parts are more accessible.
  • For new vehicles under warranty and luxury vehicles, the use of OEM spare parts is a must for their optimal functionality.



OEM Spare Parts


The OEM (Original Equipment Manufacturer) spare parts are designed and engineered according to the guidelines of a specific car brand, manufactured either by itself or a company licensed by it. These spare parts have the same specifications and quality grade as the original part fitted in the vehicle at the time of its assembly. OEM spare parts are usually available at the authorised service centres of car brands, with some brands also allowing counter sales of such spare parts for external uses.


Advantages of OEM Spare Parts

  • Since OEM parts are specifically manufactured according to the standards set by the car brand for a model, they are easier to fit and have the best possible working efficiency.
  • Given the strict production standards followed by carmakers for their manufacturing, OEM spare parts deliver higher quality control, resulting in their higher reliability and durability.
  • Most OEM spare parts come with a manufacturer's warranty, which assures peace of mind in case a replacement is required due to a fault.

Disadvantages of OEM Spare Parts

  • Due to their better quality control or monopoly by some car brands, OEM spare parts are more expensive than aftermarket spare parts.
  • Many car brands do not permit the counter sale of OEM spare parts for external use, restricting their widespread availability.

Aftermarket Spare Parts


Manufactured by third-party companies, aftermarket spare parts are available through independent outlets not affiliated with the car brands. Unlike OEM spare parts, specifically designed with a single-minded approach, aftermarket parts are compatible with multiple models and car brands. It means that there is no boundary to following the specific guidelines of one particular car brand.


Advantages of Aftermarket Spare Parts

  • Compared to OEM parts, aftermarket spare parts are more affordable.
  • One has the option to purchase several spare parts for a particular model, which is not possible with OEM spare parts, where you are left with only the choices available from the carmaker.
  • Since they are available through more widespread outlets, including online stores, aftermarket spare parts are more easily accessible.

Disadvantages of Aftermarket Spare Parts

  • Since aftermarket spare parts do not have a focused approach for a particular car brand, the quality grades and specifications may vary, ultimately affecting the vehicle’s performance and reliability.
  • Aftermarket spare parts typically do not come with a warranty. Even if they do offer one, car brands void their warranty if aftermarket spare parts are used.
  • In many cases, aftermarket spare parts also do not fit in your vehicle as seamlessly as OEM parts.

OEM Vs. Aftermarket Parts: Which is Better for You?


Most people prefer aftermarket parts over OEM spare parts to save money, as the former are more affordable and easier to buy. However, there are more factors that you should consider while choosing either of them, which are as follows:


Age and Value of the Vehicle

Always consider OEM spare parts for newer mass-market, luxury and sports cars. However, you can opt for aftermarket spare parts for older mass-market vehicles.


Type of Repair

For critical components of the core mechanical and electronic systems, it is advisable to rely more on OEM parts. However, you can consider aftermarket spare parts for cosmetic or non-essential parts of your vehicle.


Warranty Concerns

Always consider OEM spare parts if your vehicle is under the manufacturer’s warranty, as using aftermarket parts in this condition will void your vehicle’s warranty, making it more prone to expensive repairs.


Final Verdict


The decision to choose between OEM and aftermarket spare parts should not be based solely on budget, as there are several key factors to consider, including quality levels, warranty, fitting, and system complexity, before making a purchase. Aftermarket spare parts offer more affordability, flexibility and accessibility, but they can’t match the quality grades, performance and assurance of OEM spare parts for the particular car model.


FAQs


1. Is it better to use OEM or aftermarket parts?
It is advisable to use OEM parts for luxury cars and newer vehicles that are under warranty, whereas aftermarket parts make more sense for older mass-market cars. Also, for core mechanical and electronic systems, the use of OEM spare parts is more advisable compared to aftermarket spare parts, which are better for cosmetic or non-essential systems.


2. What are the disadvantages of OEM parts?
Compared to aftermarket spare parts, OEM parts are more expensive and have limited availability.


3. Why is OEM more expensive than aftermarket?
OEM spare parts are manufactured according to specific quality grades and manufacturing norms set by a particular car company, which give them better finesse and performance, for which they demand an extra premium.