Can You Mix 15w40 and 10w30 Oil? (Explained!)

Car owners have been having a hard time whether to mix a 15w40 oil to a 10w30 oil. Some car owners would say that it is okay, and some car owners would say that it is not. If you want to know more about this matter, then this article is meant for you.

So can you mix a 15w40 oil with a 10w30 oil? The answer is yes. You can mix a 15w40 oil with a 10w30 oil, but it is not recommended, and you might not also reap all the benefits of the motor oil because you have mixed the two of them.

Mixing two different motor oils in terms of their viscosity and weight stops some car owners from mixing a 15w40 oil to a 10w30 oil because they want to ensure that they encounter dangerous risks. But, on the other hand, some car owners ask because if the idea of mixing a 15w40 oil to a 10w30 oil is dangerous and produces damages to the vehicle, then why are there many car owners doing the mixing? So now, we will be discussing mixing a 15w40 oil to a 10w30 oil and what would happen if you mix both motor oils. 

This article will discuss whether you can mix a 15w40 oil with a 10w30 oil and what would happen if you mix a 15w40 oil with a 10w30 oil. So without further ado, let us start.

Can You Mix 15w40 and 10w30 Oil

Can I Mix 15w40 and 10w30 Oil?

Yes, you can mix a 15w40 oil to a 10w30 oil if you want to. If you do not want to, then you can also not mix them. The point is it depends on the owner of the vehicle. 

There are no restrictions on this, and there are no rules for the mixing, but there are recommendations. For example, it is recommended that you do not mix two different oils with different weights and with different viscosity. However, as mentioned, you can mix a 15w40 oil to a 10w30 oil if you want to. 

Some people would also say you can mix the two motor oils, but they must have the same brand. Some people also say that you can mix the two of them if you have no other choice. You can always do an oil change if you are out of the situation.

Can You Add 15w40 to 10w30 Oil?

Yes, you can add a 15w40 oil to a 10w30 oil. If you want to, then you can add it. There are no rules that say that you cannot add a 15w40 oil to a 10w30 oil if you have no choice because you may be low in oil, and there is no other available oil the same as your current oil.

Can You Add 10w30 to 15w40 Oil?

Yes, you can add 10w30 to your 15w40 oil. In other people’s experience, they have added it to their current oil, and they have no reported damages on their vehicle. This means that you can add it up, and you will be fine.

Is It Ok To Mix 15w40 and 10w30 – Possible Downsides?

Yes, you can mix a 15w40 oil to a 10w30 oil. A lot of car owners are already doing it. They have not reported any significant damages to their vehicle. 

While mixing a 15w40 oil to a 10w30 oil is not recommended and not advisable, some car owners are still doing it. This is because they have not experienced any failure on their engine or any changes in their performance. 

The possible downside can be the warranty of your vehicle. For example, if you mix 15w40 oil to 10w30 oil, you could lose your vehicle’s warranty.

What Happens if You Mix 15w40 and 10w30 Oil?

So if you mix 15w40 oil with a 10w30 oil, nothing significant will happen. Many car owners have already mixed 15w40 oil to 10w30 oil, and they have no reported damages. They said that there are no changes to their vehicle. 

While mixing 15w40 oil with a 10w30 oil does not harm your engine, it does not provide any good thing. There are no improvements to your vehicle.

Summary

In summary, people have been thinking about whether they can mix 15w40 oil to 10w30 oil. Some people are already doing it, and some people are scared of the consequences. 

However, if you mix 15w40 oil with a 10w30 oil, there are no significant changes, and there are no terrible results that can lead to engine failure. So you can mix them but remember that it is not recommended.

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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