5w20 vs 5w30 – Difference and Comparison

What is 5w20?

5w20 is one of the best engine oils available, and it is particularly well suited for use during the cold or winter months. It is important to note that the number 5 represents the viscosity rating, while the number 20 represents the weight of other oils that have been stored at a hotter temperature. So said, 5w20 oil provides engine lubrication in a manner comparable to that of any other oil with the same particle weight. Because it is lighter, it is more effective at lubricating deeper into the engine and its components, which is critical during the cold season. Having a faster flow rate than the 5w30, 5w20 is advantageous in chilly climates.

Typically, winter seasons or colder climates necessitate engine oil, which aids in the lubrication of various engine components more quickly. 5w20 is particularly popular during the winter since it is thin, which is why. 5w20 is also more efficient in the winter because it has a lower viscosity than 5w30. As a result, the fuel service has vastly improved, and the vehicle’s performance is outstanding.

The drawbacks of using oil become apparent when the weather returns to normal or becomes too hot. The lower viscosity begins to have negative consequences, and the thinner oil begins to run out. In addition, the engine’s internal components may become exposed because the oil is depleted, increasing the likelihood of wear and tear.

What is 5w30?

5w30 is one of the best engine oils available, and it is best suited for use in mild or warm conditions. It is indicated by a number between 5 and 30, with 5 denoting the viscosity rating and 30 representing the weight of other oils stored in hotter regions. It is a heavy oil with a higher viscosity as compared to 5w20. As a result, it creates greater friction and flows more slowly, dragging more heavily.

When used in normal operating conditions or throughout the summer, 5w30 is preferable to 5w20 compared to other oil types. Because it is viscous, it is thicker than 5w20 and provides better protection for the engine. In addition, because the oil is thick, it does not run out, and, as a result, the engine’s internal parts are not exposed to the elements.

It is not recommended for use in colder locations because it takes a long time to lubricate the entire engine. Generally speaking, engine oil as thick as 5w30 is not recommended in colder climates or winter. For this reason, the fuel will have a lower efficiency than usual.

Difference Between 5w20 and 5w30

  1. In comparison to 5w30, 5w20 has less viscosity and hence moves more quickly through the system. As a result, 5w30 takes longer to flow than 5w20.
  2. The viscosity of 5w20 makes it ideal for usage in frigid climates or the dead of winter. 5w30, on the other hand, is more suitable for hot climates or summer months, and it can also be used in a typical operating environment.
  3. 5w20 performs admirably in more excellent areas. In colder climates, 5w30 can’t match the performance of 5w20, but the efficiency of the fuel is greater, and the fuel’s efficiency likewise decreases.
  4. Use 5w20 in the winter to get your car or engine up and run faster. However, your engine will take longer to start or respond if you use 5w30 in the cold.
  5. When the engine is cold, 5w20, lower friction, aids in speedier lubrication; for this reason, it’s utilized in the winter to lubricate the machine, and summer is the best season to use 5w30. To keep the engine cool, it’s covered in a thick layer.

Comparison Between 5w20 and 5w30

Parameters of Comparison5w205w30
Viscosity5w20 has a lower viscosity than 5w30. Initially, it has a lower density.When compared to 5w20, 5w30 has a higher viscosity. Initially, it was thicker and denser.
Friction5w20 creates less conflict than 5w30 and vice versa.When comparing 5w30 to 5w20, there is more friction created.
Suitable climate5w20 is more suited for use in colder climates than 10w30.In warm climates, 5w30 is the best choice.
Thickness5w20 is significantly thinner than 5w30.5w30 has a higher viscosity than 5w20.
Flow5w20 has a faster flow rate than 5w30.5w30 has a slower flow rate than 5w20.


  1. https://www.sciencedirect.com/science/article/pii/S0301679X14002199
  2. https://www.sciencedirect.com/science/article/pii/S0301679X14002199