10w40 vs 15w40 Oil: What You Should Choose

When it comes to selecting motor oils, the difference between 10w40 vs 15w40 motor oils can be quite significant. Whether you choose synthetic or conventional grade oil depends on the engine and the requirements of the engine. Read the manufacturer’s manual before you choose an oil. To make your decision, consider the viscosity, thickness, and price of the motor oil. Read on to learn more about these two competing types of oil.

The viscosity of oil dictates its performance when the engine is cold. A lower number means that the oil is thinner. In cold temperatures, thinner oils tend to be less viscous. Because of this, thinner oils can be better for cold starts. On the other hand, thicker oils adhere to metal surfaces better, which reduces the possibility of corrosion. Most motor oils contain anti-wear agents.

The main differences between 10w40 vs 15w40 lie in the temperature range and viscosity. Although the viscosities of the two types of oil differ slightly, these differences are minimal. But there are some important differences between the two types of oils.

What does the W of oil stand for?

If you look at your car’s oil change sticker, you’ll notice that the “W” stands for winter. That’s because motor oil has a different viscosity depending on temperature. The higher the number, the thicker the oil will be at certain temperatures. Similarly, a lower number means a thicker oil in winter than a higher one in summer. These numbers represent how well your oil protects your car’s engine and its components.

The “W” on your car’s oil label means that the oil is winter-compatible. In other words, it is thicker in cold weather than it is in hot weather. A high viscosity oil will keep your car’s engine from seizing up, and a low viscosity oil will help you start your car in colder temperatures. You can also read popular mechanics’ articles about oil viscosity.

Advantages of 10w40

When it comes to choosing engine oil, a high-quality synthetic blend is best. 10W40 oil is highly recommended for most vehicles, as it is less volatile and has a higher pour index. Viscosity refers to the thickness of an oil’s surface and its pour index measures how easily it flows. Oils with a higher pour index flow better into moving parts. 

Lower viscosity and a higher pour index make 10W40 oil an excellent choice for a vintage vehicle. Viscosity is the thickness of oil and its rate of flow, and thinner oils increase the fuel efficiency of your vehicle as well. In addition to this, this oil will protect your car’s components against wear and tear.

If you’re wondering what the advantages of 10W40 oil are, here’s a quick explanation: it extends the life of your engine. This is an excellent choice for vehicles with high mileage, and you should consider using it when you service your car. Another advantage of 10W40 oil is its superior protection against cold. It remains thin even at low temperatures. Thus, it won’t clog hydraulic tappets or oil paths. It also reduces engine wear. The bottom line? Better performance. 

Advantages of 15w40

The 15W40 engine oil is a universal fluid with exceptional flow properties at both cold and warm temperatures. These properties make it an ideal choice for vehicles operating in all climates and climate zones. If you have a fleet of vehicles that you use frequently, then you may consider buying a 15w40 55 gallon drum.

Aside from its low price, 15w40 oil also has some significant advantages over conventional motor oils. It has higher viscosity ratings and can adapt to hot and cold temperatures, making it a better choice for use in heavy-duty diesel engines. Because of its higher viscosity ratings, 15w40 oil is suitable for a wide range of applications, including over-the-road diesel trucks, farm tractors, passenger cars, light trucks, and turbo-charged diesel engines. It can also be used in gasoline engines.

In fact, most heavy-duty trucks in the U.S. and Europe use 15W40 oil. This high viscosity type provides superior protection against wear and engine damage. However, lighter viscosity grades may have additional advantages, such as cold-starting performance and extended engine parts’ lifespan. While 15W40 oil has many benefits, you should also consider its drawbacks and other factors when choosing which motor oil is best for your vehicle.

15W-40 Heavy Duty Diesel Engine Oil is an exceptional choice for today’s most common diesel engines. Its excellent soot dispersibility and anti-sludge properties make it an excellent choice for these vehicles. The 15W40 oil is designed for modern passenger cars and light vans, and it can be used in high temperatures like in summer.

10w40 vs 15w40 – Difference in Viscosity

Motor oil is a vital part of your car’s engine. It is like the lifeblood of your car, so choosing the right kind is crucial to avoid engine damage. Learn about the difference between 10w40 and 15w40 motor oils in this article. Here are some things you should know about viscosity. These two different types of motor oil differ in viscosity and are important for your car’s health.

The first difference between 10w40 and 15w40 is the viscosity. The former is thinner, which makes it ideal for cold weather conditions and for starting your car during the cold season. The latter is thicker and has lower viscosity at high temperatures. These differences in viscosity are important to understand because viscosity numbers are accurate representations of actual viscosity at extreme temperatures.

10w40 vs 15w40 – Difference in Price

If you’re wondering what the difference in price between 10w40 vs 15w40 oil is, you’re not alone. Both oils have unique characteristics, uses, and prices. Ultimately, you’ll have to decide on which one is best for your vehicle and engine type, as well as where you live. Read on to learn about the differences between the two. For more information, contact your local motor oil supplier.

While both types of engine oil have many advantages, 10W40 costs more than 15W40. 10W40 is suitable for high mileage engines, while 15W40 is better for heavy-duty diesel engines.

Although both oils are suitable for most cars, they are not all created equal. If you are unsure of which one is best for your car, it’s a good idea to read the manufacturer’s recommendations for each. Using the right oil can prevent costly problems later.

10w40 Prices

15w40 Prices

10w40 vs 15w40 – Difference in Fuel Economy

You may be wondering whether 10w40 or 15w40 is better for your car’s engine. These types of oil differ in viscosity and temperatures, and the differences between them can be quite substantial. However, if you’re concerned about fuel economy, it’s important to understand that if the fluid has thin viscosity, it’ll be easier for your engine to push the oil, which is why 10W40 will have better fuel economy! 

10w40 vs 15w40 – Difference in Applications

When choosing between 10w40 and 15w40 motor oils, it’s important to know which one is best for your car’s engine. Both types of oil are effective at keeping your engine working at peak efficiency, but they have different characteristics. The type you choose depends on your car’s engine type and operating environment and may differ from other brands. 

Because of these differences, high-quality lubricants with low viscosities are better suited for cold-start performance. For instance, if you have a high-performance engine, you can go for 10w40 oil. On the other hand, for petrol and gasoline engines, 15w40 is your best bet!

What you should choose

A 10w40 motor oil is recommended for older vehicles. Because it’s thinner, it protects older engines from low temperatures and reduces wear. However, 15w40 is also a good choice in hot weather. Moreover, if you keep factors mentioned below in mind, you’ll be able to make a wise choice!

There are several factors to consider when choosing between 10w40 and 15w40 motor oils. Specifically, the viscosity, thickness, and cost of these oils must be compatible with your car’s engine. However, no matter the type of oil you choose, it’s essential to always check the car’s manual before you make the final decision. You should also speak with your local motor oil supplier if you’re unsure.

The viscosity of the oil determines how well it performs during cold start-ups. Thinner motor oil has a lower viscosity, so it applies less drag and static friction to your car’s engine. Also, thicker oil adheres better to metal surfaces. Oxygen exposure causes corrosion, so most motor oils contain anti-wear agents.

Can I use 15w40 instead of 10w40?

If you’re looking for new oil for your car, you may have a question: can I use 15w40 oil instead of the recommended 10w40? There are a few parameters you need to be aware of.

First, you need to know that a 10W40 oil will remain effective at low temperatures. In the case of a 15W40 oil, the viscosity of the oil will increase, and it won’t reach the friction parts of the engine as efficiently at lower temperatures. As a result, the engine will be strained and will be forced to work harder, causing it to wear more rapidly. If you have any doubt, consult your professional mechanic.


As you can see, both 10w40 vs 15w40 oils perform well in the same temperature range. However, the corresponding viscosity grades are different. A higher heat index rating means better protection against high temperatures and pressure. At the end of the day, it all comes down to the engine and type of vehicle you are driving. While keeping these factors in mind, you’ll be able to make an informed decision!