Can You Mix 5W20 and 10W30? The Ultimate Guide.

Published by Dustin Babich on

Mixing 5w20 and 10w30 is possible but not recommended as it can result in reduced engine performance. Different oil grades have different viscosity levels, and mixing them can cause issues with oil flow and engine lubrication.

It’s highly recommended to use the oil recommended by the manufacturer and avoid mixing different types of oil. Regular oil changes with the recommended oil grade are essential for maintaining an engine’s optimal performance and lifespan. It’s also important to follow the vehicle’s manual for oil change intervals and to consult a professional mechanic for any engine issues or concerns.

By taking these measures, you can ensure that your engine runs smoothly and lasts longer.

What Is 5W20 And What Is 10W30?

When it comes to taking care of a car, knowing the right type of oil to use is crucial. Two common oils used are 5w20 and 10w30. 5w20 is typically used in newer cars, while 10w30 is used in older cars or those with high mileage.

It’s not recommended to mix the two oils, as it can affect the viscosity and performance of the engine. Doing so can result in engine damage and ultimately, costly repairs. When choosing the right oil, always refer to the car manufacturer’s recommendations.

Not all oils are created equally and using the wrong one can do more harm than good. It’s important to know the differences between 5w20 and 10w30 and follow the manufacturer’s recommendations to ensure the longevity and health of the car engine.

What Happens When You Mix 5W20 And 10W30?

Mixing different oil viscosity grades like 5w20 and 10w30 can have serious implications on an engine. When you mix oils with different properties, the resulting mixture may not offer adequate lubrication, resulting in undue wear and tear, leading to engine damage.

However, in certain circumstances and emergencies, you may need to mix oils, but you must proceed with caution and follow these essential tips: 1. Ensure both oils are of the same quality and grade. 2. Mix the oils in a clean and dry environment.

3. Use the correct ratio of oils. It’s better to err on the side of caution and use less oil than more. 4. Consider changing oil and filter once you’re out of the crisis situation. 5. Consult your vehicle’s manufacturer for proper oil recommendations.

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6. Avoid mixing oils unless it’s an unavoidable emergency situation. Avoid mixing different oil viscosity grades like 5w20 and 10w30, if possible. It’s better to use a single-grade motor oil for optimal engine performance and longevity.

When Is It Acceptable To Mix 5W20 And 10W30?

Many people wonder if they can mix 5w20 and 10w30 motor oils. The short answer is yes, but only under certain circumstances. Firstly, it is important to understand the viscosity of each oil and what it means for your engine.

Secondly, you must know the vehicle’s manufacturer’s guidelines for oil viscosity. Thirdly, ensure the oil mixture remains within the recommended viscosity range for your vehicle. Additionally, only mix oils from the same brand and type. Lastly, consider the temperature and driving conditions in which the vehicle will be operated.

Mixing oils may not always be necessary or advisable, but when done correctly, it can effectively improve engine performance and efficiency.

Is Mixing 5W20 And 10W30 A Good Idea?

Mixing 5w20 and 10w30 seems like a good idea on paper but it’s not always recommended. Firstly, it can potentially affect your engine’s performance and longevity. Additionally, doing so can lead to decreased fuel efficiency and potential engine damage over time.

It’s important to always consult your vehicle manufacturer’s guidelines on the recommended oil viscosity to avoid any issues. Keep in mind that different vehicles may require different oil viscosities, and mixing them can result in unpredictable outcomes. To ensure your engine runs smoothly, stick to the recommended oil viscosity for your specific vehicle.

If in doubt, consult a professional mechanic or your vehicle’s manual before attempting to mix different oil viscosities.

How To Deal With A Mishap From Mixing 5W20 And 10W30

Mixing 5w20 and 10w30 can have negative effects on your engine. If you mistakenly mixed them, here’s what you need to do. First, check the owner’s manual for recommended oil. Next, drain the oil and replace it with the recommended oil.

Be sure to run the engine for a few minutes to spread the oil. If the engine is damaged, seek professional help. It’s best to avoid mixing oil types to prevent mishaps. Be aware of the viscosity differences between oils, and stick to the recommended oil.

By following these steps, you can prevent further damage to your engine.

Frequently Asked Questions On Can You Mix 5W20 And 10W30

Can You Mix 5W20 And 10W30 Oils?

Yes, you can if you want to achieve some middle-ground viscosity. You can mix two different blends of oil, but it’s not always recommended as it brings down the performance of the high-quality oils.

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What Happens If You Mix 5W20 And 10W30?

Mixing 5w20 and 10w30 oil can lead to a weakened base oil, oxidation, and will make it thicker. The way it holds up in extreme temperatures will be compromised, and your engine may lose out on performance with excessive fuel consumption.

What Kind Of Damage Can Mixing Engine Oils Cause?

When you mix engine oils, the chance for increased engine wear and sludge buildup can occur. Over time, this can lead to engine damage and shortened engine life. Additionally, improper oil weights can lead to poor fuel economy, increased emissions, and poor lubrication.

Can The Same Brand Of Engine Oil Be Mixed?

If you must mix oils, it’s recommended that it is of the same brand, type, and viscosity grade. Mixing brands can lead to a weakened oil blend, which can have negative effects on performance and engine wear. Mixing oils may also void warranties offered by oil manufacturers.

How Do I Know What Oil Viscosity My Engine Needs?

It’s recommended that you consult the owner’s manual for the specific oil viscosity grade your engine needs. The manual will list the recommended grade based on factors such as engine type, displacement, and expected operating temperature range.


It is always important to follow the recommended guidelines for oil viscosity and type for your vehicle. Mixing oils with different viscosities can heavily impact your car’s performance and potentially harm your engine. In the case of mixing 5w20 and 10w30 oils, it is not a recommended practice.

The different viscosities of these oils can cause issues with oil flow and proper lubrication, which can damage engine parts over time. While it may seem like a convenient solution, it’s important to stick with the oil weight and type recommended by your owner’s manual.

By doing so, you’ll ensure that your vehicle’s engine is properly lubricated, allowing it to perform at its best and extend its lifespan. In the end, investing in the right type of oil for your car is worth it. So the next time you’re considering mixing oils, it’s best to stick to the recommended guidelines.

Dustin Babich
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Dustin Babich

Dustin Babich

As the passionate author behind, Dustin Babich is a knowledgeable expert in all things automotive. With a deep understanding of car tools, equipment, engines, and troubleshooting techniques, Dustin Babich shares invaluable insights, practical tips, and effective solutions to empower readers in overcoming car-related challenges.


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