Can You Mix Different Brands Of Oil? [Explained & Solved]

As a passionate driver, do you want to use different oil brands in your automobile? But you won’t be sure, is it good or not? You won’t reach the final decision. Here you get your dream answer with details.

Yes, you can mix different oil brands in your engine because only 15-20% of the previous oil level exists in the engine wear and consumes about 80% of oil to generate the engine strength. You can mix synthetic with minerals or various viscosities. It will be better to keep your vehicle’s engine fit.

So, replacing your old oil brand, you can use a more reliable and authentic brand to increase engine sustainability. Let’s check the detailed answer of, can you mix different brands of oil with meaningful research.

Can You Mix Different Brands Of Oil Risk-Free?

As a conscious driver, you need to focus on engine performance regularly. If you feel your old oil brand wouldn’t perform properly and provide lower mileage day by day, you need to change your old brand and replace it with a new and authentic regular motor oil brand. But the question arises, is it risk-free?

The answer is yes. You have nothing to worry about replacing old oil brands. Instead, it will be a practical decision to save your engine from unexpected conditions. It will also help you to get better performance with excellent mileage. 

The new oil helps generate fuel in a proper sequence in the engine combustion chamber. As a result, the internal components would be free and more active in responding to issues.

When you need to fill your motor oil tanker, more than 80% of the oil change interval will be consumed to generate power. 

When using the new brand oil, there is a little oil staying into the back that is not harmful, without hesitation, you can use the new brand oil for increasing mileage and engine durability.

Why Need To Mix Different Oil Brands?

If your old oil brand doesn’t perform well and won’t get enough mileage, you can replace it with new conventional motor oil analysis viscosities or synthetic oil brands.

After mixing, you would get good results. But have a matter of concern, never mix the previous engine oil brand more times. It will lose your engine productivity.

Here we try to focus on some crucial points why we need to combine different types of oil brands.

Increase Engine Durability

When using an old oil brand, your engine durability will collapse. That’s why you need to replace it, and it will help you increase the engine’s durability. To keep the engine fit, use reliable and standard synthetic oil brands.


Many people have an objection to oil change compatibility. So you can choose the different synthetic motor oil brands that are modified with updated additives and business new. So before use, check the additive of any base oil brands.

Reduce Stress

When using old version oil brands in a classical engine, stress and harmful impact on the engine protection and decreases performance. Various viscosities of the oil brand help reduce the engine’s extra stress gently.

Availability & Pricing

When you go out to a different or new place, you won’t get your old oil brands here. In that case, you need to refill the oil tank, so to the available oil brand and keep an eye on the issue. 

Is It Right To Mix Synthetic & Mineral Oil?

No, you shouldn’t mix these two. The different manufacturer’s formulations of synthetic blend processes are different from each other.

The chemical ingredients would collapse and create an imbalance if you mix them. So try to use only one sludge, don’t mix them.

Synthetic Oil

Synthetic oil is introduced with a chemical compound and artificially made. The producing formula is closely related to the chemical chain reaction and symbolized specifically.

Here, using chemically modified petroleum components instead of a crude oil mix. This oil is also synthesized from other raw materials.

Mineral Oil

Mineral oil is introduced with a colorless, odorless, and straightforward mixture of higher alkynes. It will synthesize from original mineral resources and particularly distillate from petroleum that is also usable as edible vegetable oil.

It’s developed in the past few centuries and is a natural oil without chemical formula. 

Recommendation: Mineral oil can be the best option for cheap pricing and natural inflation.

Is It Good To Mix Different Oil Brands Again & Again?

The answer is no. If you have any objection to your regular oil brand, you can change it and mix it with a different oil brand.

But if you continuously do that, there are some problems and causes of damage. That’s why many responsible people wouldn’t recommend mixing the brand in the engine. Let’s check some points.

Damage The Engine

If you mix the different brands of oil viscosities (e.g- Mobile1 5W-30 & Valvoline SAE 5W-20)  more times and in a habit, it will cause a destructive impact on your engine.

It will even cause your engine spark plug to turn off and won’t work. So try to avoid mixing synthetic oil regularly, but a maximum of one or two times.

Disturb Adaption

Generally, for technical manufacturer issues, all oil brands are different. Their oil-making formulation is not the same though they maintain the API guidelines.

We do not even have enough knowledge of chemistry. So if you are mixing oil brands regularly, there will be an imbalance and not appropriately adapted.

Imbalance Temperature, Oxidation & Film Strength

Every oil brand has its formula and especially adds temperature issues. In the industrial space, it also focuses on the oil’s oxidation and film strength.

These are essential to adjust to the engine components and perform with a balance. If you change oil brands repeatedly, engine oil circulation would collapse.

People Often Ask

What Will Be When Mixing Different Synthetic Oil Brands?

Hopefully, there wouldn’t be a harmful impact because synthetic oil viscosity producers influence all synthetic oil brands in the same formulation process.

Their chemical components would be about the same. That’s why it can easily mix with conventional oil.

Can I Mix Both Mobile 1 & Castrol?

It’s tough to mix in the same condition. If you can make the same properties thickness, viscosities, and weight, you can mix it. Otherwise, this idea wouldn’t count as acceptable and try to avoid it.

Is It Right To Mix 5W30 With 10W40?

No, it’s not right at all. 10w40 and 5w30 oil particularly bear the different values of components, and the thickness is also different.

In that case, it will clump together and make a complex fuel economy. So, it would help if you didn’t mix 5W30 with 10W40, but you can mix 5W30 with 5W40.

Can I Mix Valvoline With Castrol?

If you have no objection to the upcoming performance, you can mix Valvoline with Castrol edge.

But if you want to get a better version of your engine for a long time, it’s not a good idea. But in a critical situation, you can use Castrol 5W30 with Valvoline 5W30.

Is It Good To Mix Engine Viscosities?

Yes, there is no confusion here; you can use the same brands with different viscosities for a long time. But keep in mind, not mix in the same ratio.

You can use 20% from the leading viscosities oil type brand for better performance. Otherwise, the viscosity balance will collapse and fall.


After reading the full context, hopefully, you get a clear concept of can you mix different brands of oil. If you want to integrate other synthetic or different viscosity mineral oil into your engine and mix oil brands, you should keep in mind that you don’t mix again and again.

Otherwise, it will create a harmful impact on your fuel circulation system. The thickness of fuel is terminated into the block that makes a barrier to oil flow in the combustion chamber.

If you have any doubt, you can get help from a mechanic or expert. Hopefully, your idea will be too clean and reach the final decision.

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