0w40 vs 5w30 Synthetic Oil

Are you curious to know the distinction between 0w40 and 5w30 synthetic oil? Both oils are effective alternatives to conventional motor oils, yet have distinct properties. In this blog post, we’ll compare these two types of oil and help you determine which one suits your car best.

0w40 vs 5w30 Table

We will discuss the differences between these two types of oil and help you decide which one is right for your vehicle.

0W40 Oil

5W30 Oil

Castrol 0W-40

Valvoline 5W-30

Liquid Volume 32 Fluid Ounces

Liquid Volume 5 Quarts

Detergents and antioxidants

Cleaning agents and thermal properties

Fluid TITANIUM Technology & Syntec Power Technology


Appropriate Weather is Winter

Appropriate Weather is Both Winter and Summer

Suitable for use in Petrol, Diesel and Hybrid cars

Designed for modern petrol engines

High level of engine protection from the moment you turn on the ignition.

Protects against engine wear & LSPI

Porsche A40, VW 505. 00 and 502. 00, Mercedes Benz 229.5, 229. 3

GDI/TGDI engines, turbocharged, supercharged vehicles

Why Compare?
Both oils are designed to improve performance over traditional motor oils, but there are some important distinctions between them. Choosing the right oil for your vehicle ensures optimal performance and fuel efficiency.

The first difference between these oils is viscosity. Viscosity is a measure of an oil’s ability to flow. 0w40 oil has a lower viscosity than 5w30 oil, which flows more easily. This can provide better engine protection at cold temperatures. The oil will flow more readily and reach critical engine parts more quickly.

On the other hand, 5w30 oil has a higher viscosity, which does not flow as easily. This can provide better engine protection at high temperatures because the oil will not thin out as much and provide a thicker cushion for moving parts.

The main difference between 0w40 and 5w30 Synthetic Oil is the viscosity. This means 0w40 oil flows more easily and can provide better engine protection at cold temperatures. However, the 5w30 oil has a higher viscosity and may offer better engine protection at high temperatures.

Viscosity Level
Viscosity level is very important as it determines the flow resistance of an oil. The numbers can determine the oil viscosity as in 0w40 and 5w30. Here, W refers to winter, and the precedent number indicates the oil’s resistance in freezing temperatures as 0 degrees Celsius.

The lower the number, the thinner the oil is in winter. And the number after W recommends the thickness of the oil at 100 degrees delicious hot temperature. The Castrol 0w40 is thinner, which means it has a low viscosity. The Valvoline 5w30 is thicker and has high viscosity level.

Both are great considering the viscosity level; Valvoline 5W30 does wonders for extra compact engines that need extra lubrication.

Performance in Different Weather
As both oils are multigrid, they are compatible under any weather. To compare the better one, let’s deeply dig into the details.

The Castrol 0W40 is thinner, and unusually, oils tend to thicken during winter. Thus this thinner oil can pump up even during the coldest temperature around. No matter how cold the environment gets, this oil can start working quickly. And the heat tends to thin the oils. And as the oil is already thin during summers, it is likely to be thinner.

So, The Castrol 0W40 is appropriate for the winter and cold parts of the world. Even the manufacturers also focus on the composition for European regions.

On the contrary, The Valvoline 5W30 is thicker in consistency but not too thick to go through difficulties during winter. It can simultaneously ensure the same efficiency and lubrication during winter. And this takes time to lose its thickness even in extreme heat, and it also strikes in hot weather.

The Valvoline 5W30 is considered the universal oil for performance parameters in different weather. It is widely used in Indian subcontinents and Africa and is widespread in cold areas.

Friction and Wear Protection
The intensification of pressure within the engines accelerates the occurrence of friction. And continuous friction leads to 10% wastage regarding engine performance. It can also cause overall engine deterioration and even complete engine damage.

The Castrol 0W40 is backed with Fluid TITANIUM Technology to prevent friction. To be precise, the molecular structure of titanium creates a temporary cushion within the engine’s interior and protects the part from damage. This technology decreases robbing friction by up to 20%.

The Valvoline 5W30 comes with groundbreaking additives and is proven through (the industry Sequence IVA wear test) to be 50% more wear protection than contemporary oils.

Deposit Prevention
Castrol 0W40 is composed of detergents and antioxidants. Its innovative Syntec Power Technology claims to prevent the deposit of unburned or partially burned particles, debris, fragments of engine wear, metal wastage, etc. Valvoline 5W30 uses detergents and thermal properties to reduce sludge deposit building and maintain overall engine quality.

Drain Interval
Drain interval is the indication of fuel change determined by the manufacturers. Drain interval is measured in two ways they are Miles and Time. For Castrol 0W40, the drain interval is around 10,000 to 15,000 miles or six months under everyday driving. And for severe or rough driving, oil changes can be more frequent.

The Valvoline 5W30 has a drain interval of three months and 3000 miles on average driving. But the brand recommends that driving 10 miles a day or starting the engine rigorously can result in frequent oil changes. Again, the brand claims that appropriate usage can even lead the drain interval to 150,000 miles.

Can You Mix Castrol and Valvoline?
While mixing two multi-grade oils to maximize the outcome is pretty cool, the same does not go for these two different brands. No one should ever mix oils for two other brands as they primarily differ in build composition and lab standards. Henceforth, the two multigrid can be combined but only with the same brands.

SAE 0W-40 and 5W-30 are oils used in gasoline and diesel cars. They are known for their performance in both hot and cold temperature situations. Also, both oils are made from base oil with additives such as detergents and antioxidants.

If you live in a hot climate, the SAE 0W-40 is not a good option as it does not perform well in high temperatures. The Valvoline SAE 5W-30 would be a better choice for you. However, if you live in a cold climate, the Castrol SAE 0W-40 would be a good option as it performs well in cold temperatures.

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