Can You Mix 5w20 and 10w30 Oil? (Explained!)

If you plan to mix two motor oils with different viscosity and weights, you might be thinking about its effects and the consequences you will have to face. If you are looking for some answers, this article is the answer. Keep reading for enlightenment.

So can you mix 5w20 and 10w30 oil? The answer is yes; you can mix 5w20 and 10w30 oil. However, remember that you will not have a better performance, and this mixing is not recommended.

A mixture of two motor oils that have different viscosity and also have different weights is done by most drivers. So a lot of drivers are already doing it. Even if they have different weights and viscosity, both oils will still do the job. 

So you must be thinking about what happens if you go on mixing 5w20 and 10w30 oil. You might be tempted to do the same with other drivers, but you want to know what happens if you do such a thing. Some people and experts would say that the mixing of both oils is never recommended. 

So what would you do if you get stuck in a place where there is no available oil that is the same as the oil you currently have on your engine? So this is where this question comes in. 

So if you wish to know more about the issue, this article is meant for you. Stay and keep reading!

Can You Mix 5w20 and 10w30 Oil

Can I Mix 5w20 and 10w30 Oil?

Well, this question has two answers from everyone: yes and no. If you mix two oils with different weights and different viscosity, you will not have to worry about danger and damage because both of the oils you have mixed will still lubricate your vehicle’s engine and components. But you have to remember that mixing two of these oils will not make your vehicle display excellent performance. 

It will also not improve the performance of your vehicle. The reason behind this is that the additives in the motor oils are put there for their reasons and functions. 

Therefore, the additives inside the different oils will not be compatible with each other. As a result, your vehicle’s engine will not be able to enjoy the full benefits that one motor oil can offer.

Can You Add 5w20 to 10w30 Oil?

Yes, you can add 5w20 to 10w30 oil, but it is never recommended. It is advised that you should not mix the two of them. The 10w30 oil is much thicker than the 5w20. 

You can add it up, but it will not improve the performance of your vehicle. It will also not give any efficiency to your engine. 

You can also make sure that you will have the same brand for both of the oils. Again, this is to ensure close compatibility for the oil.

Can You Add 10w30 to 5w20 Oil?

In vice versa, yes, you can also add 10w30 to 5w20 Oil, but it does not mean that you should do it. On the contrary, you should avoid it as much as you can. 

In your owner’s manual, it is stated there that you should only use the recommended motor oil for your vehicle. It might not be stated there not to mix, but mixing motor oils is not advisable.

Is It Ok To Mix 5w20 and 10w30 – Possible Downsides?

Yes, you can mix 10w30 to 5w20 oil, but mixing two oils is not recommended for everyone. This is because mixing two oils has not proven to have advantages. So if there are no advantages and good results, why would you do it? 

The possible downside is that your warranty for your vehicle can be voided. So as recommended and as the rule of the thumb, you should stick with just one oil and not mix two oils.

What Happens if You Mix 5w20 and 10w30 Oil?

If you mix 10w30 to 5w20, there are no significant damages. There are no changes at all. So you will notice no significant problems that can happen. 

So if ever you find yourself in situations where you have no choice, you can do the mixing. Just make sure that you will not do it consistently. 

If you mix 10w30 to 5w20, both of these oils will keep on their side and separate. They will not blend and become one.


In summary, many of you are wondering if you can mix 10w30 to 5w20 oi. The answer can be two different ways. Some people will say yes, and some people will say no. 

In reality, you can add and even mix the two, but it is not recommended. Instead, you should stay with your current oil as much as you can.



Image credits – Canva

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My name is Hank, and I've been in the automotive industry for 27 years. I've been working in my own auto repair shop for the last 13 years, and now I want to help you here, on my blog. Let me know if you have any questions. Read more