0w-40 Vs 5w-30: Which Motor Oil To Choose?

0w-40 and 5w-30 are common names when it comes to motor oils. They are both synthetic oils and offer pretty good properties. And that’s where the confusion comes in. Most people get puzzled while choosing the right oil for their vehicle. Are you one of them too?

Well, don’t worry, we’ve got you sorted!

Which one to choose, 0w-40 vs 5w-30?

0w-40 is an oil of low thickness and is better for low-temperature uses. It also provides better fuel economy. Contrarily, the 5w-30 is more viscous. So it works in higher temperatures as efficiently in lower temperatures. Though 5w-30 is not fully synthetic, it is better for rough driving.

We know this isn’t enough to make a decision. Head over to our article to know all the details!

0w-40 vs 5w-30: Quick Overview!

0w-40 and 5w-30  both consist of almost the same elements. Their viscosity and limiting temperature are almost the same as well. Despite all these, there are a lot of differences between them.

Let’s take a look at the basic differences that these two have. This will give you a better idea of what to choose between 5w-50 and 0w-40.

TypeFully synthetic type oilSynthetic blend type oil
CompositionPAO-4, PAO-6, PAO-8, additives(some antioxidants and detergents)PAO-4, PAO-6, PAO-8, additives(some antioxidants and detergents), mineral base oil(SN 100, SN 150, SN 500)
ViscosityMore viscousLess viscous
CostVaries from brand to brandDepends on the brand
TemperatureCan flow up to minus 30 degrees CelsiusCan flow up to minus 25 degrees Celsius
Fuel EconomyGives better fuel economyRelatively lower fuel economy but works well in both cold and hot temperature
Strong PointFuel changes not needed, suitable for diesel and gasoline enginesWorks better for rough driving, ideal for old model vehicles

0w-40 vs 5w-30: Detailed preview!

Still, wondering if you should choose 0w-40 instead of 5w-30? Well, this section will clear all your doubts, so sit back, relax and read along. Because we’ve discussed all the features of these oils in detail below-


Motor oils consist of base oil and some other supplementary substances like detergents and antioxidants. They have properties like- lubrication, friction-reducing, and cleaning. 

Usually, there are 3 types of motor oils- synthetic, semi-synthetic, and mineral oils. Synthetic oils are considered the best oils for vehicles. 0w-40 is a 100% synthetic type of oil. On the other hand, 5w-30 is synthetic blend oil where some mineral oil is present.


The composition of 0w-40 and 5w-30 is almost the same. The only difference is 5w-30 contains a portion of mineral oils. The main elements of 0w-40 are PAO-4, PAO-6, and PAO-8 synthetic-based oils. It also contains antioxidant and detergent additives.

The 5w-30 contains all the elements mentioned above, just like the 0w-40. Additionally, it has SN 100, SN 150, SN500 mineral-based oils as well.


You can understand the viscosity of motor oils by their names. Both 0w-40 and 5w-30 are multi-graded motor oils. That means their viscosity in low temperature and normal running conditions temperature is mentioned. 

The more viscous the oil, the thicker its consistency is. Generally, thinner oils have better flowability. 

The viscosity indexes of 0w-40 and 5w-30 are 186 and 154, respectively. At 40 degrees celsius, their viscosity is 70.8 and 63.2. So we can say both of them are of less density and viscosity. Thus they provide better flowability and increased horsepower in high temperatures. 

However, the 0w-40 is slightly less viscous and is more flowable.


The price of the oils usually depends on different brands. But on average they cost around 25-28 dollars. Sometimes people tend to buy from unauthorized shops to save some money. But it impacts very severely on the engine in the long term. 

Bad motor oils can make your engine wear. 


Motor oils are used in vehicles in different parts of the world. And different parts of the world have different temperatures. But the good news is that the multigrade motor oils are suitable for a wide range of temperatures. 

However, it doesn’t mean they can work in infinitely low temperatures. The lowest temperature 0w-40 can flow minus 30 degrees Celsius.

In the case of 5w-30, this temperature is minus 25 degrees Celsius. On the other hand, in higher temperatures, 5w-30 gets an edge because of its thicker consistency.

Fuel Economy

One of the key features to look into motor oil is fuel economy. Cost-efficient motor oil can save you a lot of money. The thinner the concentration of oil, the more cost-efficient the oil is.

In that sense, 0w-40 will give you better fuel efficiency. But 5w-30’s thicker consistency has an advantage as well. It performs much better in extreme hot and cold conditions.

Strong Point

This is a point where we will discuss the various advantages of both oils. The 0w-40 oil is more suitable for diesel and gasoline engine cars. 

For the old model vehicles, the 5w-30 is a better option. Fuel changes are not required for the 0w-40. And if you are up for rough driving, you might consider the 5w-30.

Can I use 0w-40 Instead of 5w-30?

Yes, you can, although it isn’t the most popular option. Because 0W40 oils are shallower compared to 5W30 oils, they may not operate as well in some certain engines. Engines that demand additional viscosity to sustain ideal viscosity. This is at starting and even during higher operating temperatures.

What Happens If I Mix 5w-30 with 0w-40?

When it comes to mixing these two, just the grades should be combined, but not the never the companies. These two can be used together. The first is heavier than the second, and the extra fluidity would make the starter process go more smoothly. The temperature is a key aspect that will determine how you will be able to mix them or not. If it is hot, both oils will work perfectly, but in a cooler place, the 0w will have the dominant position.

That was all we had about 0w-40 and 5w-30. We hope now you won’t have any hard time choosing oil for your vehicle.


Question: What are the uses of 0w-40?

Answer: 0w-40 is very popular among many types of European vehicles. That includes Porsche, Volkswagen, Mercedes-Benz, etc. Because of their thinness, they are gaining popularity in American cars as well.

Question: Can I use 0w-40 during summer?

Answer: Yes, the 0w-40 can be used during summer, spring and winter. The only disadvantage is that it won’t be as efficient as the 5w-30 during the summer because 0w-40 has a very low consistency.

Question: Which one of the following is economically better, 0w-30 or 5w-30?

Answer: The 0w-30 has a low consistency and viscosity. The lower thickness helps to get you better fuel economy. So from an economic perspective, 0w-30 is a better choice.


So this was all about 0w-40 vs 5w-30. Now you can easily pick motor oils for your car. Just be careful to buy the oil from a reliable supplier.

If you still have any questions, let us know.

See you next time!

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