5w30 vs 10w40 Oil: What You Should Choose?

Truck and car owners often overlook the importance of keeping their vehicles well-oiled. It can lead to big problems like a decrease in overall mileage down the road, mainly if you use the wrong oil at high or low temperatures. In the world of motor oils, 5w30 vs 10w40 oil is a long-standing debate. Both oils have pros and cons, and truck drivers cannot choose between them.

If you are like most people, you probably do not know much about your truck’s engine, and that is ok. Most of us do not need to know how our trucks work. However, it is best to know the different grades of oil that your engine likes, as this can affect its performance. These oil grades also protect the engine at different temperatures. This article will look at the properties of both these oils and try to settle which oil is the better choice.

What is the W in the Characteristics of Oil?

The “W” in the characteristic of oil stands for “winter.” Companies design the best motor oils for use in cold weather conditions. Such oils have a lower viscosity than other oils, which means they can flow more easily in different parts of the engine and provide better protection for your engine in cold weather. The number before W shows the viscosity of oil in cold weather.

The number after W shows the viscosity of oil in warm weather. If the number before W is small, the oil is thinner, and it will perform well in cold conditions. On the other hand, if the number after W is large, the oil will perform well in hot weather. Engines have complex machines made up of many moving parts.

To keep these parts moving smoothly in winter and prevent them from wearing down, you need to use motor oils having W in their name. Over time, car engines break down and become less effective because of improper oil. Good quality engine oil also helps to protect against wear and tear, and it can help to improve fuel economy.

Pros & Cons of 5w30

SAE 5w30 is one of the best multigrade motor oil that your engine likes and is commonly used in modern cars and trucks. It is a synthetic oil that provides optimal performance and protection in a wide range of temperatures. The first advantage of this multigrade oil is that it can help improve fuel mileage. 

This oil is designed to flow more efficiently at a low temperature, which can help reduce friction. Another advantage of using 5w30 oil is that it can help protect the engine parts from wear and tear. This oil is designed to burn more cleanly, which can help reduce emissions and environmental impact.

Royal Purple 01530 SAE Multi-Grade Synthetic Motor Oil 5W30 Pack of 6 Quarts

as of December 5, 2022 12:39 am

However, this oil has some disadvantages, such as increased engine deposits and shorter oil life. It means that you may need to change your oil more often than you would with other oils. Another downside of using 5w30 motor oil is that it may not be suitable for high-performance engines. It can also be more prone to leaks and is less effective at a high temperature.

Pros & Cons of 10W40

SAE multigrade 10w40 oil has a number of benefits, including its ability to lubricate engine parts, increase the mileage and protect against wear. This oil is thicker, and the motor likes it so that you can use it at higher temperatures. 10w40 oil can also extend the life of your engine by helping to prevent corrosion and build-up of debris. 

Royal Purple 36140 HPS 10W-40 High Performance Street Motor Oil - 1 Quart (Case of 6)

as of December 5, 2022 12:39 am

10W40 motor oil is less likely to break down at higher temperatures. There are a few potential drawbacks to using 10w40 oil in your truck. One is that it can be less effective in cold weather. 10w40 oil can also be more challenging to find than other types of oil.

5w30 vs 10w40 – Difference in Viscosity

It is vital to discuss viscosity if you want to understand the 5w30 vs 10w40 topic. SAE multigrade 5w30 oil has low viscosity than 10w40 oil, which means it flows more easily and can be pumped through an engine more easily at low temperatures. The viscosity value of 5w30 in cold conditions is 5, while that of 10w40 is 10. On the other hand, SAE 10w40 is thicker than 5w30 and is beneficial in a warm environment. The viscosity value of 10w40 in hot conditions is 40, while that of 5w30 is 30.

5w30 vs 10w40 viscosity chart

5w30 vs 10w40 – Difference in Price

The price of motor oil is affected by several factors, including the type of oil, the brand, and the specific formulation. Synthetic oils are more expensive than semi-synthetic or conventional oils. Multigrade 5w30 oil is synthetic, which means it is made in a lab rather than extracted from crude oil. This makes it more expensive to produce oils due to their specialized formulation. 

Red Line 11405 10W40 Motor Oil - 1 Gallon

as of December 5, 2022 12:39 am

On the other hand, the price of 10w40 oil is lower than other types of oil for several reasons. First, SAE 10w40 is semi-synthetic oil and a less refined product than other oils. Second, 10w40 oil is generally less available than other oils, making it a less popular choice among consumers.

5w30 vs 10w40 – Difference in Fuel Economy

Everyone likes a better fuel economy, which is usually a measure of how much fuel your car uses per kilometer when you drive it. Fuel economy is essential for both environmental and financial reasons. 

Reducing fuel consumption can help reduce air pollution and greenhouse gas emissions and save drivers money on fuel costs. When you consider 5w30 vs 10w40, the less viscous oil will have better fuel economy than the more viscous one. So, in this case, 5w30 oil will be more beneficial.

5w30 vs 10w40 – Difference in Applications

If you are considering using 5w30 vs 10w40 oil in your truck, check your owner’s manual to see if there is a difference in applications of both of them. Usually, 5w30 works well in a light-duty diesel or petrol engine. On the other hand, 10W40 oil works well in high-performance gasoline and diesel engines. You can also use multigrade 10w40 engine oil in old damaged cars with oil leaking problems because of its high viscosity.

What You Should Choose

5w30 vs 10w40 oil is the most common discussion when choosing the best type of engine oil. It depends on a few factors, such as the climate you live in and your engine type. The oil you use should be based on the manufacturer’s recommendations and your driving habits. First, you need to check the owner’s manual and see what is recommended, but if you cannot find one, here is a general rule.

If you drive in cold weather, do a lot of stop-and-go driving, and can afford an expensive engine oil, you need to use 5w30 motor oil. It will provide you with good mileage and increase the fuel economy. If you live in an environment with having higher temperature and your truck’s engine is old and high-duty, it is recommended to use thicker oil like SAE 10w40.

Can I Mix 5w30 and 10w40?

The quick answer is yes; you can mix SAE 5w30 and 10w40 motor oil together. It is essential to understand that 5w30 and 10w40 are not the same. They are both motor oils, but mixing these two oils may not provide the best results. Each oil has its properties; one is thicker than the other, and mixing them can cancel out some of the benefits of each oil. If your engine likes the mixed oil, it will perform well; otherwise, mixing will not increase your vehicle’s performance.

Mixing them will decrease the additives’ properties in 5w30 and 10w40 oil. Before adding mixed oil to the engine, you should remove any remaining old oil present in the engine before adding the mixed oil. Also, ensure that you use the oils of the same brand. You should use 50 percent of 5w30 oil and the remaining 50 percent of 10w40 oil. However, it is a legal process to mix oils, but it is not recommended because this process can void your new vehicle’s warranty. Mixing can also create clumps of oil which may affect the efficiency of the engines.

Can I Use 5w30 Instead of 10w40?

It is generally not recommended to use a lighter weight oil than a heavier one, as this can cause engine damage. If you consider using a low viscosity oil like 5w30 in your engine, it is essential to weigh the pros and cons carefully. Talk to your mechanic to see if it is the right choice for your car. However, if you are in a pinch and need to use a lighter weight oil, you can use 5w30 instead of 10w40 oil. Check your vehicle’s manual to see if this is your vehicle’s recommended oil weight.

Final Words on 5w30 vs 10w40

In concluding the discussion of 5w30 vs 10w40 oil, it is recommended that you use the good quality oil with the proper viscosity, which will give better mileage for your engine. Ultimately, you should only use the one that your owner’s manual recommends. You may face the consequences if you do not use the oil recommended by the manufacturers. In short, at a low temperature 5w30 oil has low viscosity and flows better, making it ideal for cold weather conditions. At a high temperature, 10w40 oil is more viscous and will perform well.