Can I use 5w40 instead of 5w30

Most drivers don’t pay attention to the quality of oil they pour into their vehicles. You should note that the quality level of oil in cars has a lot of contribution to a perfect driving experience, and poor-quality oil can cause some car problems. It’s advisable that you know what’s the right oil for your vehicle.

Some people always ask if they can use the 5w40 instead of the 5w30, now here’s the answer.

Both types of oil are good no doubt. The 5w30 is used by different kinds of cars with different temperature ranges, but this is ideal for cold temperatures. The 5w40 is usually used for a high mileage engine which performs better in warm temperatures. Let’s learn more about this.

What’s the difference between the 5w40 and 5w30?

5w30 oil is specifically designed to operate at low temperatures like -25oc but also can be used for a warm climate that is up to 25oc. in total, 5w30 is a good multi-grade oil that can be used for different types of temperature specters. It is also very fuel efficient.

5w40 is a type of oil that penetrates the active mechanism very fast, and it provides very good lubrication to start with. The number “40” means that it is different from the other motor oil (30) used for cars, this is denser and ensures more lubrication in hotter climate conditions.

This oil is often used when there is a higher mileage car because it is way thicker than the 5w30 oil, and it provides better lubrication for the parts inside your vehicle that work and is strained or aged as a result causes them to wear off.

The working viscosity of this oil 5w30 ranges from 9.3 to 12.5mm2/s while that of 5w40 has a larger viscosity than 5w30. 5w40 is a better choice to use when you are starting your engine at a low temperature because it flows very easily at these temperatures.

When your engine is running, and it is hot, 5w40 has a high viscosity and it is very effective in protecting your engine against wear and tear.

Is 5w30 good for high mileage?

Amazon basics which are a full synthetic is said to be the best 5w30 oil that is suitable for high mileage vehicles. This oil should mainly be used for vehicles exceeding 75,000 miles. This motor oil was formulated for vehicles going at high speed that is longer drain intervals.

This helps to prevent any build-up during drain intervals and also prevents corrosion and rust.

Is 5w40 best for high mileage cars?

Although 5w30 is used by different types of cars with different temperature ranges, this is very ideal for colder climates. 5w40 is mostly used for higher mileage car engines and performs way better during warmer temperatures.

5w-40 motor oil is made to flow like a 5-weight oil in winter temperature from a cold start and like a 40-weight oil when your engine reaches the normal operating temperature. Although 5w30 oil is mostly used over a range of temperatures which makes it is the most used oil in the market.

This is because 5w30 is a winter viscosity graded motor oil. It performs effectively for those who use it at a high temperature and it works better for those who drive in cold temperature regions.

Because of its low viscosity, it is normally recommended for petrol using cars or light-duty diesel engines. It is also highly recommended for SUVs, light trucks, and passenger cars.

5w30 is lighter and has good fuel consumption while 5w40 has poorer fuel economy and provides greater pressure but less flow but 5w30 is way more expensive.

5w30 multi-grade oil can also be used for light duty uses in passenger cars and light trucks, engines that do not carry a heavy load, and environments with fluctuating temperatures because it is less vulnerable to a thermal breakdown.

But some people switch to the 5w30 oil when the temperature gets cold because this provides protection for your engine and also helps the engine to deposit.

Is 5w30 oil good for diesel engines?

A diesel engine burns at a high compression rate that is higher than that of petrol engines.

For this, they need a fully synthetic engine oil or high viscosity that will work well under a good temperature setting. This oil to be used should be strong enough to withstand pressure and a high temperature and still lubricates your car engine’s parts.

While the 5w30 oil is very good for light-duty diesel engines, it is better to go for a more suitable oil good for heavy-duty engines, that is the 5w40 engine oil.

What is the key difference between 5w30 oil and other oil?

5w30 has a good low-temperature viscosity grade when compared to oil like 10w-30 oil.

Because of this 5w30 is less viscous during a cold climate setting. This low viscosity means that this oil does not thicken in a colder temperature and that it flows smoothly within the engine without any friction.

When 5w30 is compared to other oils its viscosity grade is way better during the winters, which helps prevent the car engines from tearing and wearing although this is because of the anti-wear additives.

5w30 can work with temperatures that are as high as 950F, ensuring to switch to a higher and better temperature oil viscosity grade.

This type of oil is not recommended in extremely cold temperatures, the car engine will need a thicker oil that has proper cushioning and bearing support. A 5w30 oil is way thinner than other types of multi-grade oil for example 5w40 and it might not lubricate your car’s engine very well.

Is 5w30 Synthetic Oil?

5w30 has different types, there is synthetic motor oil and conventional oil also known as mineral oil. The difference between these two is that synthetic motor oil is usually prepared by rebuilding and breaking down petroleum molecules that help to produce a Well Refined base oil.

Various additives are added to this for better engine life and maximum engine protection. While the 5w30 conventional motor oil is made of base oil that contains refined crude oil, anti-wear additives are then added.

Although these two types of 5w30 have similar constituents, synthetic motor oil has a far better performance than mineral oil.

What Are Some Benefits of Using 5w30?

It works efficiently with a large range of light trucks and car engines; it is also quite versatile and covers a good amount of temperature range. So, these are some of its benefits.

  • Due to the low-temperature viscosity grade, this oil reduces the chances of a thermal breakdown and helps boost your car’s engine lifespan.
  • It is saved for long-distance travel which might require a good mileage oil that has low oil consumption rates.
  • 5w30 multi-grade oil is perfect for vehicles that are used a lot during seasonal climate zones. Its temperature for operation can go as low as -22oF and as high as 95oF.
  • It helps to protect the internal combustion engine parts and provides start and stop performance when compared to a thicker oil.
  • 5w30 can be used on older engines because most vehicles with old engines need lightweight oil which does not cause too much exertion or pressure on the motors (parts).


Is 5w40 oil used only for Diesel or Petrol?

It is suitable for both gas, petrol and diesel engines of vans and passenger cars that do not have turbochargers. The 5w40 viscosity is a good recommendation for engines found in European vehicles that have gas-powered engines and in American diesel pickup trucks.

Is 5w30 oil usable for heavy-duty use?

It is recommended that 5w30 is used for only light-duty diesel and petrol, but also 5w30 can be managed for heavy-duty if it is used for the appropriate temperature (that is a colder climate).

The 5w30 can withstand a moderate amount of pressure and extremely cold temperatures due to its high viscosity. Make sure you avoid using a high temperature and heavy-duty use for this viscosity grade oil, because this may cause cushioning and inadequate lubrication due to high pressure which will impact fuel consumption and efficiency.

In terms of viscosity, conventional motor oil behaves like synthetic oil. But over time this deteriorated very fast thereby affecting the car’s engine by causing low performance and fuel efficiency. 5w30 synthetic oil has more performance on the engine and is more stable, lubricates engine parts well and has better engine protection.

What makes the 5w30 different from the 5w40?

The 5w30’s working viscosity is at 9.3mm2/s up to 12.5mm2/s. But that of the 5w40 is about 12.5mm2/s to 16.4mm2/s. This data tells us that the 5w40 is much larger than the 5w30 in terms of viscosity.

Is it OK to top up my engine oil using a different brand?

To an extent, you are allowed to add any brand of engine oil you want, as far as it meets the right specifications. It should have the official approval of the Original Equipment Manufacturer. It’s not all about the brand, but the oil specifications and viscosity level registered in the manual of your vehicle. Always use that as a reference when deciding which oil to purchase.

Final Verdict

Despite the quality of the 5w30 and 5w40 oil, it is only proper to check with your car’s manual or manufacturer for any oil recommendation as each car engine is built completely different from the other one. Using the correct engine oil is the most important way of taking care of your car, with a regular oil change and maintenance.

Quality oil will help optimize metal friction and increase the engine’s lifetime.

You should also follow the manual to choose the right oil for your car based on fuel economy, engine type and external temperature to avoid issues with your engine.

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