Updated at: 15-03-2022 - By: micdot

Your engine relies on motor oil to function properly. Your engine’s performance will suffer if it isn’t properly lubricated. Motor oil is necessary to lubricate and protect your vehicle’s engine because when it is running, the internal parts of your automobile and engine are grinding against each other, which is why you need it when driving. As a result, it is clear that motor oil is essential to the health of your engine. In addition to the need of using the right motor oil, you should also be familiar with the many types of oil that can be used in your engine. If you make a mistake on that, your engine will be damaged since it will not be lubricated properly.

This means that the viscosity type must always be the correct one for the application. As a result, we’ll now discuss the variations between 10w40 and 20w40 motor oils. This is where we will begin.

What Is the Difference Between 10w40 and 20w40 Oil?

There is a significant difference between 10w40 and 20w40 motor oil in terms of performance. There are, however, very few differences. So, let’s compare the viscosity, fuel efficiency, and hot weather performance of 10w40 and 20w40 motor oils.


Motor oil with a 10w40 viscosity indicates that the 10w was used in the winter. Low temperatures mean that the motor oil will flow at its maximum viscosity or viscosity. Low w numbers indicate that the oil can withstand lower temperatures in the colder months. For example, a 20w40 motor oil specifies that the viscosity of the oil will decrease within a certain range at 100 degrees Celsius, for example.

Fuel Economy

The viscosity of multi-grade motor oil varies with temperature. When it’s chilly outside, the engine’s parts need to be well-lubricated with oil that can flow freely. Ten-grade oil when cold and forty-grade oil when heated are the viscosities of a 10w40 motor oil. In the event of freezing temperatures, a 10w40 motor oil can be swapped out for a 20w40. While the 20w40 motor oil provides superior lubrication and performance across a wider temperature range, the 10w40 motor oil is more cost-effective.

Hot Weather

Having trouble starting your car is almost guaranteed if you’re driving in the cold, especially during the winter months. The starter can be overworked if it is continually cranked. Because the motor oil is too thick to flow smoothly, it will have a difficult time getting into the engine and lubricating it. Due to the lack of lubrication, your engine will wear out more quickly than normal. Because of its lower w rating, the 10w40 motor oil provides superior performance in cold weather.

Because of its high w number, 20w40 motor oil does not operate well at low temperatures. This is where the two motor oils diverge.

Can I Use 10w40 Instead of 20w40?

Yes, you can; however, you should always adhere to the oil recommendation provided by your vehicle’s manufacturer. For example, if your vehicle’s recommended oil is 10w40, don’t use 20w40, although you have the option to do so if you choose. This is due to the fact that 10w40 and 20w40 motor oils both have a temperature rating of forty and one hundred degrees Celsius. This means that at a temperature of 100 degrees Celsius, the viscosity or thickness of both engines is the same. In the same conditions, an oil with a 30-point rating would be thinner.

Accidentally Used 10w40 Instead of 20w40: Is It Ok?

You can, but it’s best to go with the suggested viscosity for your engine. It’s recommended to use a 10w40 motor oil rather than a 20w40 motor oil since it provides greater lubrication and better performance in a wide range of temperatures.

10w40 vs 20w40 High Mileage

For automobiles with a lot of miles on the clock, a 10w40 motor oil should be used. Thick oils, such as 10w40, are more ferocious, and they can assist older engines tolerate high temperatures and prevent wear and tear. If the motor oil is thicker, it will help extend the life of your engine by reducing wear and tear. However, if your car is old and has a lot of miles on it, you should use 20w40, especially if you’re burning oil.

Which Is Better, 10w40 or 20w40 Oil?

Smaller numbers describe how oil behaves at 40 degrees Celsius; a 20w at 40 degrees Celsius is 10 times thicker than your engine requires. The 10w40 motor oil, on the other hand, is six times thicker than the 5W-30. As a result, the answer to this question is that it depends on the make and model of your vehicle, as well as a few other variables. The oil and viscosity recommendations for each vehicle are unique.

When should I use 10w40 and when 20w40?

The 10w bit indicates that the motor oil should have a maximum viscosity in a 10w40 specification. In colder climates, the lower the W number, the better. To ensure proper viscosity, the 10w440 specifies a viscosity of 40. The 20w bit and the W stand for winters in 20w40 motor oil, indicating that the oil should have a specified viscosity. Again, a lower W value indicates that the oil is better suited to use in colder climates. You should follow the manufacturer’s advice for oil with these features.

10w40 vs. 20w40 Toyota

All Toyota engines should be lubricated with 5w30 motor oil. If you’ve got a four- to six-cylinder engine, this oil will do the job just fine. When it comes to choosing between 10w40 and 20w40 motor oil, it all depends on your driving habits. Depending on the sort of vehicle you’re driving, you may be experiencing this issue. Driving in temperatures above 90 degrees Fahrenheit necessitates the use of 10w40. Using 20w40 motor oil in cold weather is likewise a bad idea.

10w40 vs. 20w40 Nissan

5w30 is the recommended motor oil for Nissan. Instead of 5w30, you could use 10w30. Whether you should use 10w40 or 20w40 motor oil will be determined by the type of vehicle you drive and the conditions you encounter on the road. It’s okay to use 10w40 or 20w40 if it’s hot outside, but always stick to the manufacturer’s recommendations for your specific car.

10w40 vs. 20w40 Subaru

Synthetic oil in the 5w30 and 0w20 weight ranges is suggested for Subaru vehicles, as is conventional oil in both cases. Whether you should use 10w40 or 20w40 motor oil is a matter of personal preference and the type of car you drive. During extremely hot weather, ninety degrees Fahrenheit can be used. It is possible to use 20w40 motor oil in high temperatures, but it is not recommended because it does not function well in freezing conditions.

10w40 vs. 20w40 Mazda

Mazda recommends using 0w20 motor oil in nearly all of its vehicles, including crossovers and SUVs. 5w30 will be requested by the lone standout. There are a number of factors to consider when deciding whether to use 10w40 or 20w40 motor oil. The manufacturer’s suggestions can still be found in your vehicle’s owner’s manual. You can use either 10w40 or 20w40 motor oil at high temperatures, but it is still up to your vehicle’s manufacturer to make the final decision.

10w40 vs. 20w40 BMW

Your BMW may run on 0W-40, 5W-30, 0W-30, or 10W-60 motor oil. Your vehicle and driving conditions will determine whether you should use 10w40 or 20w40 motor oil. 10w40 and 20w40 motor oils will not work well in freezing weather, therefore you should check with your vehicle’s manufacturer before using them.

10w40 vs. 20w40 Ford

In the 2020 Ford owner’s manual, 5w30 or 0w30 is recommended for most engines. Dependent on your vehicle and a few other factors, you should use either 10w40 or 20w40 motor oil. When using motor oils that are not included in the owners manual, it is still important to consult your owner’s handbook or the manufacturer.

10w40 vs 20w40 Chevrolet

Motor oil for Chevrolet engines should be 5w20, 5w30, or 10w30, according to the manufacturer’s recommendation. Oil with a viscosity rating of 10W-40 or 20W-40 will be used in hot climates, not cold. Because they are so useful, it doesn’t mean that they can be used every day. Dependent on your vehicle and a few other factors, you should use either 10w40 or 20w40 motor oil.

10w40 vs. 20w40 Jeep

0W20, 5W20, 5W30, or 10W30 is the recommended viscosity for Jeep vehicles. The vehicle you’re driving and the driving circumstances you’re in should be taken into consideration when deciding whether to use 10w40 or 20w40 motor oil. Consult your owner’s manual if you’re not sure which oil to use in high temperatures.

10w40 vs. 20w40 Volkswagen

5W30, 5W40, or 0W40 oil is the recommended motor oil for Volkswagen. If you drive a car that requires 10w40 or 20w40 motor oil, you must take into account the type of vehicle and the driving conditions. Always seek the advice of a trained specialist if you find yourself in this situation.


In summary, as much as motor oil is essential for maintaining your vehicle’s excellent condition, knowing the right and recommended motor oil for your engine. There are a variety of factors to consider when determining whether to use 10w40 or 20w40 motor oil. Any of these products should be used only after consulting your vehicle’s owner’s manual to determine the required motor oil. High-temperature items are both useful.