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

There have already been a number of automobile owners who have mixed 10w30 and 10w40 oil and reported no problems with their vehicles or engines. However, many drivers are reluctant to do so because they are concerned about the possible negative implications of mingling. That being said, let’s get to it. Is it possible to use 10w30 and 10w40 oils together? A resounding yes, mixing 10w30 and 10w40 motor oil is permissible. Even if you’re able to mix the two, it doesn’t imply you should. It’s not a good idea.As previously stated, a large number of car owners are already mixing the two lubricants. A large number of people have stated that the combination had no negative impact on the performance of their engines or cars. As a result, many other motorists have taken note of the event and are now participating in it as well. Some automobile owners, on the other hand, are firmly opposed to the idea, arguing that it could hurt the engine and the vehicle in some way. This article is a must-read if you’re interested in learning more about it. There is a question about whether or not 10w30 and 10w40 oil can be mixed.

We’ll also talk about the effects of mixing the two oils. Stay for an in-depth discussion if you have the same concerns and are interested in learning more. Let’s get started, shall we?

Can I Mix 10w30 and 10w40 Oil?

10w30 and 10w40 oil can be mixed together. However, you should be aware that this is not something you should do. It is not recommended that you carry out this action. You can, however, blend 10w30 and 10w40 oil if you have no other option. You need to make sure that each of these oils are from the same producer and have the same brand. This guarantees that both of them have the same set of additives, ensuring their compatibility with each other.

Ensure that the engine is able to run on both 10w30 and 10w40 oil before making the switch. The 10w40 motor oil may be too thick for some high-performance engines. Lighter oil is commonly used in today’s engines. This is done in an effort to reduce the overall consumption of gasoline. You’ll get a lot of different responses if you search the internet or ask anyone about this. As far as I can tell, some drivers think it’s fine, and some drivers think it’s not fine. In actuality, however, this is not recommended and should be avoided. When using 10w30 and 10w40 oil in combination, the oil pressure decreases as the motor speeds up. Bad bearings are also possible.

Can You Add 10w30 to 10w40 Oil?

Yes, you can mix 10w30 with 10w40 oil. Many motorists have already taken advantage of this practice. This may happen to you as well. Because there is no accessible oil that matches your existing oil, you may need to refuel. As a result, you’ll need to combine them all together. That’s fine, but it’s not a good idea. You can do the top-up without fear of damage or engine failure if you have no other option.

The additives in both oils should be the same, so be sure to do the same. Because of this, you must make sure that both oils are from the same manufacturer.

Can You Add 10w40 to 10w30 Oil?

Even if you’re using a 10-W-30, you can still add 10W-40 oil. You will find yourself in a position where you have no choice but to top-up. Another thing to keep in mind is that both oils must be labeled with the same manufacturer. If the oil is the same brand, then the additives are the same as well. Because of the oils’ compatibility, this is the case.

Engine Oils 10w40 vs. 10w30

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

This is a question that elicits a wide range of responses. If you poll the general public, everyone will have an opinion. Others will say it’s fine. In some cases, others may object to it. It’s possible that you’re unsure of who to trust and who to follow. If you don’t reside in a cold climate, you may be able to get away with blending these two oils, according to some motorists. The engine and vehicle will not be seriously damaged if you mix these two lubricants. It’s improbable that anything will happen. If you only add a small amount of the other oil, some folks think it’s fine.

Most car owners are still wary about using both oils in their vehicles. People who drive cars are concerned about losing oil pressure when cornering at high RPMs if two oils are mixed together. The spinning of a bearing or even two bearings can then occur. It’s important to be aware of the potential drawbacks of this mingling. The warranty of your vehicle may be impacted if you use a mixture of two different oils in your vehicle. Fuel usage can also be affected by it. When the engine is cool, both of the oils will perform identically. It’s possible to mix if you find yourself in a situation where you need to. Keep in mind, however, that if at all possible, keep them separate.

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

Nothing significant will happen if you combine 10w40 with 10w30 oil. There have been no reports of damage or alterations to the vehicles of those who have already begun using it. However, this does not imply that you should do this on a regular basis and make it a habit. This is something you should stay away from. The warranty on your vehicle may be voided if you mix it up.


Accordingly, a lot of car owners are wondering if they may use 10w40 and 10w30 oil at the same time. Many motorists will answer affirmatively, and many have been doing so for some time. The concept is opposed by other drivers. However, there’s no reason why these two oils couldn’t be combined. It’s possible to jeopardize your car’s warranty. However, your car will not be severely damaged.