Updated at: 13-03-2022 - By: micdot

A lot of doubts have been raised about the safety and compatibility of mixing different weights of motor oil. Stay for an in-depth discussion if you have the same concerns. Is it possible to combine different types of motor oil? For the most part, it is not advisable to combine different viscosities of motor oil. Because your motor oil’s viscosity must be kept constant to meet the needs of your vehicle’s engine, mixing them together will result in a changing viscosity. Before we get into the nitty gritty, let’s have a look at what an oil weight is. When we discuss oil weights, we’re referring to the oil’s viscosity. At a certain temperature, the flow of the oil is measured in terms of its viscosity. This is a frequently asked subject due to the fact that it is sometimes unavoidable to combine two oils with varying viscosities. Everybody has to know if you may combine a given viscosity level of motor oil with another viscosity level of motor oil.

There are some people who have previously done this, but you don’t see the long-term effects because your vehicle and engine are still running properly. With this information, we will be able to blend motor oil weights with confidence going forward. Let’s get this party started.

Is It Ok To Mix Different Weights Of Motor Oil?

It’s never a good idea to combine two oils that have vastly differing viscosities or weights. Some motor oils, on the other hand, may be able to be mixed with others that have different viscosity levels. However, you should keep in mind that they must be using the same kind of motor oil. In order to produce their motor oil, each motor oil manufacturer employs a variety of technologies and machines. With them, each brand of motor oil will have a variety of products. Therefore, if you intend to use the same kind of motor oil, it is vital to mix it.

This is a no-no, according to the general rule of thumb. There’s a good reason why this isn’t a good idea. If you combine several brands and viscosities of motor oil, you’ll get a different viscosity. Let’s compare 10w30 and 5w30, for example. As compared to the 10w30, the 5w30 is both thinner and lighter. As a result, the 10w30 is more viscous than the 5w30. As a result, it is possible to combine the two. However, if you can avoid it, you should not do so. There is no guarantee that combining two different viscosities of motor oil would not harm your engine.

What Happens If You Mix Different Weight Oils?

It’s not a good idea to blend two different types of motor oils. It’s already not a good idea to combine two oils with the same viscosity. If it’s two different viscosities of motor oil, it’s a lot more difficult. Using the term viscosity, we’re referring to the motor oil’s viscosity. For a certain vehicle, it is necessary to have a precise viscosity. Your vehicle and engine may be damaged if you use the incorrect motor oil, which has the incorrect viscosity level.

Damage to your engine is possible. As a result, if you combine two different types of motor oil, the viscosity of the oil may change. Alternatively, the oil can thicken or thin out. As a result, your car will be in jeopardy. It’s not enough to simply talk about the weight of the motor oil; you need to know its viscosity as well. The oil’s viscosity is a measure of the oil’s thickness.

There is a certain amount of viscosity required for your vehicle and engine to function properly. Your engine will accept the results if your viscosity level shifts since you have added another motor oil with a different viscosity. This means that you can’t just use any motor oil. Find and read your owner’s manual if you haven’t already. The owner’s manual will tell you how much viscosity you need to get your vehicle up and running. SAE, the society of automobile engineers, provided the viscosity for this project.

Each type of motor oil has a corresponding viscosity rating. To put it another way, a higher viscosity number indicates that the oil is more viscous. It would also allow for a more progressive movement of the motor oil. The oil’s viscosity also has an impact on how well it protects the engine’s internals. Moving sections of the vehicle will also be protected from heat and friction.

What Is The Correct Way To Mix Different Weight Oils?

In general, it is not a good idea to mix different oil weights. As a result, the correct method of mixing things up is not something that has a precise and accurate piece of data. However, if you’re going to blend multiple types of oil, be sure they’re all the same brand. Even drag racers blend up two different motor oils and two distinct brands to generate their viscosity for trivia purposes. – However, even if you are aware that some people are already mixing, it is not suggested and it is not easy to do so. Many things will be required of you.

If you combine two types of motor oil that have different densities or viscosities, problems could emerge. As a result, mixing it is never a good idea. As a result, the general guideline is to disregard this and stick with a single brand of motor oil.


In a nutshell, the viscosity of the motor oil is measured in oil weights. It refers to the engine oil’s viscosity. The viscosity level of the motor oil might vary depending on the make and model of the vehicle. If you were to mix one motor oil with another of a different viscosity, what would happen? If that’s the case, you can adjust the viscosity to something that’s neither suggested nor appropriate for your car.