5w30 vs 5w40: Determining Which Motor Oil is Right for Your Car

People often get confused when it comes to picking the right motor oil for their car. They use to get trapped between the two main oils – 5w30 and 5w40. Both these motor oils come with different properties and specifications. So, to help you find the best one for your car, we’ve compared the two of them with more precision. Explore 5W30 vs 5W40:

5w30 vs 5w40 – Which One is Better?

The main purpose of the motor oil is to protect your car by reducing friction and wear of the movable parts. A large variety of motor oils is available on the market. Out of which 5w30 and 5w40 are the most preferred choice of the people out here. Here are a few features of both these types of oils.

Highlighting Features of 5w30

Know about 5w30 vs. 5w40
Learn about 5w30 vs. 5w40. Source: EngineLabs

5w30 is a type of motor oil that helps to make your vehicle engine hum like a new one. It provides greater lubrication and protection to your car’s engine. Besides, it helps in increasing the fuel economy of the vehicle. Some of the prominent features of this motor oil are:

  • Improves overall performance
  • Offers excellent wear protection
  • Lubricates the engine
  • Used for normal to extreme driving conditions
  • Suitable for diesel, gasoline, and multi-valve fuel engines

Highlighting Features of 5w40

Choosing between 5w30 vs. 5w40
Buying the right motor 5w30 vs. 5w40. Source: THMotorsports

The 5w40 is crude-based motor oil that is best fit for diesel and gasoline engines. This motor oil is usually used for cars that are under warranty. Here are some important features of this category of oil:

  • Suitable for vehicles that use unleaded and leaded gasoline

  • Low volatility

  • Helps to reduce oil utilization

  • Excellent thinning resistance against heat

  • Comes with multiple approvals

Difference Between 5w30 and 5w40

To decide which type of oil is best for your vehicle, here are some key differences mentioned below:

1. Viscosity

This term is defined as how well the liquid will flow through the engine. The working viscosity of 5w30 is basically from 9.3 to 12.5mm2/s whereas the operating viscosity of 5w40 is 12.5 to 16.3mm2/s. That means 5w40 has larger viscosity than 5w30. So, 5w30 is better than 5w40.

2. Fuel Economy

When compared in terms of fuel efficiency, 5w30 is more fuel economical than 5w40. It works amazingly fine with an extensive set of vehicles having different engine kinds.

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3. Price

If we compare the cost of both these motor oils, 5w30 is comparatively more than that of 5w40. However, it is worth every single penny.

4. Temperature Range

You can use 5w40 in the temperature range of -25OC to 35OC. On the other hand, 5w30 is used in the temperature range from -25OC to 35OC. To explore more about the temperature range of these motor oils, you can refer to maintenance tips by car experts.


So, when it comes to picking the right motor oil 5w30 vs 5w40, the former is clearly the winner. The 5w30 motor oil operates smoothly with any engine type regardless of the temperature and provides better protection and lubrication.

Next time you wish to buy motor oil for your vehicle, go for 5w30.

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