Lubrication is needed for every part of a machine that moves by itself. Lubrication with oil helps reduce wear and tear caused by friction. If you use the wrong gasoline, your car won’t run as well.

The 5W-40 and 10W-30 Engine Oils are two of the most used car fuels. Much back and forth is going on when choosing between these two options. This post will compare and contrast 5W-40 and 10W-30 engine oil.

What is the 5w40 oil?

What is the 5w40 oil

5w40 is a type of engine oil with a viscosity between 5 and 40. In this sentence, the letter “w” stands for winter. 5w40 oils have a winter viscosity of 5, which means they are less thick at shallow temperatures. When the temperature goes up, the oil gets thicker, which shows that it is only thick.

5w40 oils have a viscosity between 12.5 and 16.3 mm2/s. This crude oil can be used in cars that run on leaded or unleaded gasoline. Most Americans and Europeans who drive gas or diesel pickup trucks use oil with the number 5w40.

The most appealing thing about 5w40 engine oil is how reliable it is. Also, when 5w40 is put to the test, its performance improves. This high-end production is only possible because of the synthetic blend oil used. It is made to act as an ultra-shield and protect the engine from dirt and other things that could hurt it.

Aside from that, this oil can work even when it’s freezing outside and can start up quickly. A chemical that cleans itself makes sure that the parts don’t get dirty or rust.

Because of this, your car’s engine will last longer in a linear way. Also, the oil’s ability to stay stable at high temperatures is a big part of why it doesn’t go rancid. It also doesn’t give off many things that could be dangerous. Because of this, it is safe for the environment as well. Because of everything it does, this oil is a must-have.

What is the purpose of 5w40 oil?

5w40s are often recommended for vehicles with many miles because they are thicker than other motor or engine oils and can handle heat better. Cars that run in cold places should use engine oils with a rating of 5w40.

Some of the most well-known manufacturers think that this oil is a good choice for modern engines because it lubricates modern engine parts at the right time.

When 5w40 oils are heated, they get thicker than other oils. Because of this, both mechanics and drivers like engines that get a lot of miles per gallon. 

5w40 oils are better at lubricating motors that are worn out or have been stressed. Oil with a viscosity of 5w40 works well in places where winter temperatures can drop as low as minus 41 degrees Celsius.

When the engine is cold, these oils are enough. But they aren’t the best choice for places that get cold.

What Is 10w30 Engine Oil?

What Is 10w30 Engine Oil

Compared to 5w40 oils, 10w30 oils have a lower viscosity of 10 and a higher viscosity of 30. Even though it’s thicker than 5w40, it’s still considered a light oil. 

While the engine is warming up, 10w30 oils are a great way to keep the moving parts from getting stuck. When a 10w30 oil is used in a diesel engine, the oil gets a little thicker than usual.

What’s the purpose of 10w30 motor oil?

Using 10w30 engine oils is an excellent idea for older cars. This oil is perfect for older engines that need a more robust way to keep them oiled. But at temperatures below zero, 10w30 oils don’t work as well as they should. 

People who drive cars with many miles on them often use 10w30 oils. After the engine has warmed up, the heavier oil helps lubricate the parts that move. This oil is perfect for cars that need to run in winter temperatures as low as 10 degrees Celsius. If you stay in a cold climate, you should use a 5w40 engine oil instead of a 10w30.

You need to watch the gear, engine, and clutch when you drive your car. To keep these parts working well, you need to give them the proper lubricant.

So, 10w30 is great engine oil that is cheap and gets you the extra miles you want. Also, 10w30 can be used in everyday situations and has the proper viscosity to make sure engine parts move smoothly. If you want the best possible lubrication for your car’s engine, this is your oil. One of this oil’s best qualities is that it doesn’t change much in temperature.

It’s a hard oil that doesn’t need to be changed for long, but it works very well. Also, the oil’s ability to cause friction is a big reason it works so well. No matter the weather or temperature, 10w30 engine oil always works well and at a steady pace. The SAE numbers show that this type of oil has a viscosity of 10w30.

The number shows that the oil’s viscosity is ten at low temperatures and 30 at operational or high temperatures. This oil is essential in the winter and summer to keep your car running smoothly.

The cylinders in the block move back and forth, which causes wear and tear on the engine. But if you use 10w30 oil as the proper lubricant, you can cut down on the amount of contact between the block and the cylinder.

Differences between 5W40 and 10W30 Engine Oil?

The 5w40 motor oil and the 10w30 motor oil may have some similarities, but they are made very differently. You need to know the 5W40 Vs 10W30 engine oil if you want to drive safely. 


When the temperature is 100 degrees Celsius, 5w40 motor oil has a viscosity index of 176 and a viscosity of 13.7. When heated to 100 degrees Celsius, its viscosity is 10.7% higher than regular 10w30 motor oil. W means winter.

The following number is the viscosity, or thickness, of the motor oil at low temperatures. 5w40 motor oil has a winter viscosity grade of five, for example. This means that this motor oil is less dangerous when below freezing.

When the engine is excellent, 10w30 motor oil has a viscosity of 10w. If the engine is hot, it’s thirty.

Efficient use of fuel

Depending on your needs, you can get good fuel efficiency with either 5w40 or 10w30 motor oil. All motor oils on the market today can improve gas mileage. Using 5w40 motor oil will cut your motor oil usage by a lot.

Also, the 10w30 motor oil has very low friction, making it as effective as possible. Choosing an oil suggested in your owner’s manual is best to get better gas mileage.


The 5w40 motor oil has a reputation for being reliable. Even under a lot of pressure, this engine oil still does a great job. The anti-contamination properties of this product also protect the high viscosity of motor oil in the engine from getting dirty and stop contamination from happening.

High-viscosity motor oil is the best way to ensure fluidity in every situation. Using 10w30 motor oil is also good because it makes the engine last longer and is well lubricated.

Comparison table of 5W40 Vs 10W30 Engine Oil

5w40 oil10w30 oil
176 is the viscosity index.
146 is the viscosity index.
The amount of sulfated ash is 1.3The amount of sulfated ash is 0.8
At 100oC, viscosity is 13.7At 100oC, viscosity is 10.7
We passed API ILSAC GF-5 grade.We passed API ILSAC GF-5 grade.
Modern vehicles, SUVs, passenger cars, and light trucks can all use it.SUV and Truck engines can use it.
The amount of oil used is meager.Better friction properties mean that the oil will work well.
This oil has many features and is loved for how well it works. It’s good enough to go the extra mile.Powerful cleaning and good protection are both included. The oil can be implemented all year round and is also cheap.

FAQ About 5W40 Vs 10W30

Is it OK to put 10w30 oil in a 5w40 engine?

As long as the chemical compositions of the synthetic oils are the same, they will mix perfectly. It’s lovely to mix when it comes to 10w30 and 5w40. 5w40 and 10w30 engine oils have similar viscosity. Therefore, they can be mixed without causing any harm to the vehicle.

Which is better: 5w40 oil or 10w30 oil?

You can’t use these oils as a whole. There’s no way that a 5w40 motor oil could be a lot better than a 10w30 motor oil for no reason. This means that there needs to be a base or a set of rules.

In this case, your owner’s manual will tell you what kind of oil to use. If your owner’s manual says to use 5w40 motor oil, you should do.

so. On the other hand, if your engine needs 10w30 motor oil, go ahead and use it.

Final Verdict

Using the most perfect engine oil is essential for keeping the engine cool, clean, well-lubricated, and safe. Your car will work more OK and last longer than ever if you use the right motor oil.

Our article has provided you with helpful insights about choosing the right oil for your car. We hope you choose wisely and that your car’s engine gets the best protection possible.