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Difference between 5W30 and 5W40

Difference between 5W30 and 5W40

When it comes to engine oil, there are many different types and grades available on the market. In this blog post, we will be discussing the difference between 5W30 and 5W40 motor oils. Many people are unsure of which type of oil is best for their vehicle, so hopefully, this post will provide some clarity.

What is 5W30?

5W30 is a type of motor oil that is typically used in passenger vehicles. It is made up of a base oil, which is typically petroleum-based, and additives that help to improve the oil’s performance. The “5W” refers to the oil’s viscosity, or thickness, at low temperatures, while the “30” refers to its viscosity at high temperatures.

5W30 oils are designed to maintain their viscosity over a wide range of temperatures, making them ideal for use in both cold and warm weather. They are also significantly thicker than 5W20 oils, making them better suited for use in high-performance engines. However, 5W30 oils can also be more difficult to flow through engines at cold start-ups, which is why they are not always recommended for use in very cold climates.

What is 5W40?

5W40 is a type of motor oil that is used in many modern vehicles. It is made up of 5 different weights of oil, which are combined to create a single viscosity. The 5 weights are measured in terms of kinematic viscosity, and they range from 5 to 40 cSt.

5W40 oil is typically used in vehicles that have high-performance engines, as it provides excellent protection and lubrication. It is also able to withstand high temperatures without breaking down, making it ideal for use in hot climates. 5W40 oil is available from many different manufacturers, and it is typically compatible with most modern engines.

Difference between 5W30 and 5W40

5W30 and 5W40 motor oils are both multi-grade oils. 5W30 oil is thinner than 5W40 oil and is better suited for use in cold weather conditions. 5W40 oil is thicker than 5W30 oil and is better suited for use in hot weather conditions. 5W30 oil is also less likely to cause engine damage than 5W40 oil.

  • 5W40 oil is also more likely to improve fuel economy than 5W30 oil. 5w30 and 5w40 motor oils are both available in synthetic, semi-synthetic, and mineral varieties. Synthetic motor oils are the most expensive but offer the best protection for your engine.
  • Semi-synthetic motor oils are a middle ground between synthetic and mineral motor oils. Mineral motor oils are the least expensive but offer the least protection for your engine.
  • 5w30 and 5w40 motor oils can be used in all types of vehicles, including cars, trucks, vans, SUVs, motorcycles, etc. 5w30 and 5w40 motor oils can also be used in all types of engines, including gasoline engines, diesel engines, and hybrid engines.


The bottom line is that 5W30 oil is lighter and thinner than 5W40, meaning it flows more easily at lower temperatures. This makes it a better choice for colder climates or vehicles that don’t see a lot of use during the winter months. If you live in a warm climate or your vehicle sees a great deal of action year-round, then 5W40 would be the better option.

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