Can you mix 0w20 and 5w20?

Oil is the lifeblood of your car’s engine, but with so many different types and grades available, it is challenging to know which one to use. One common question that many car owners and mechanics have is whether it’s safe to mix 0W20 and 5W20 oils.

In this post, we’ll explore the perplexing and sometimes controversial topic of mixing oil grades. We’ll cover the basics of 0W20 and 5W20 oils, whether they can be safely mixed, and the potential impact on engine performance and efficiency. So, let’s discover if mixing 0W20 and 5W20 oils is the right choice for your vehicle.

Can you mix 0w20 and 5w20

What are 0W20 and 5W20 oils?

0W20 and 5W20 are two common oil grades used in modern engines. The “0W” and “5W” refer to the oil’s viscosity, or thickness, at low temperatures. The “W” stands for winter and indicates that the oil has been tested and approved for use in colder temperatures. The lower the number before the “W,” the thinner the oil is at low temperatures.

Both 0W20 and 5W20 oils are designed to provide excellent performance and protection for modern engines. They are typically recommended for use in newer vehicles, as they are formulated to meet the latest industry standards and provide better fuel economy than older oil grades. However, it’s always ideal to consult the owner’s manual to determine your vehicle’s best oil grade.

Key differences between 0W20 and 5W20 oils

When it comes to comparing 0W20 and 5W20 oils, there are several key differences to consider. These include:

Viscosity at low temperatures

As mentioned earlier, the “0W” and “5W” in the oil grades refer to the oil’s viscosity at low temperatures. 0W20 oil is thinner and flows more easily in cold weather, which can help to reduce engine wear during cold starts. 5W20 oil is slightly thicker and may take slightly longer to circulate through the engine during cold starts.

Fuel efficiency

0W20 oil is typically recommended for use in newer engines with tighter tolerances, providing better fuel efficiency than 5W20 oil. This is because the thinner oil can flow more easily through the engine, reducing drag and improving fuel economy.

Wear protection

0W20 oil also provides better wear protection than 5W20 oil, thanks to its thinner viscosity and ability to circulate quickly through the engine. This can be particularly important in newer engines with tighter tolerances, where excessive wear can lead to reduced engine life.

High-temperature protection

While 0W20 oil provides better fuel efficiency and wear protection, it may not offer the same level of high-temperature protection as 5W20 oil. 5W20 oil is typically recommended for use in older engines or those that operate in hotter climates, where high-temperature protection is essential.

Why is it necessary to mix oils?

  • If you find yourself low on one kind of oil but have some other types available, it may be tempting to mix them to avoid a trip to the store.
  • If you need to top up your oil level between changes, it may be necessary to use a different oil grade than what is currently in your engine.
  • Some car enthusiasts like to create custom oil blends for their specific vehicles, and mixing two different oil grades may be part of this process.

Factors to consider when mixing oils

Oil viscosity and compatibility

The two oils being mixed should have similar viscosity and be compatible with each other. Mixing oils with vastly different viscosity or incompatible additives could cause engine damage.

Additive compatibility

Some oil additives can react negatively with others when mixed, causing engine damage.

Mixing ratios

Mixing oils in a 50/50 ratio is generally safe, but it’s essential to consult your owner’s manual or a trusted mechanic for specific recommendations for your vehicle.

See Also: Can overfilling gas tank cause car to stall: Fueling mistakes

Can you mix 0w20 and 5w20?

Yes, you can mix 0W20 and 5W20 oils. However, it’s essential to consider some factors before doing so to avoid potential engine damage. These factors include ensuring similar viscosity and compatibility between the two oils, checking for additive compatibility, and consulting your owner’s manual or a trusted mechanic for specific recommendations for your vehicle.


  • Mixing oils allows for a custom blend catering to specific engine needs.
  • It can be a cost-effective way to avoid buying a new oil batch.
  • Mixing oils with similar viscosity and compatible additives can potentially provide better protection for your engine.


  • Mixing oils with incompatible additives or vastly different viscosity can cause engine damage.
  • This may void your engine’s warranty, so it’s essential to consult your owner’s manual and the manufacturer.
  • Mixing oils that are not compatible with each other can lead to reduced engine performance and efficiency.

How to mix 0W20 and 5W20 oils?

Tools needed for mixing oils

  • Two oil bottles or containers
  • Funnel
  • Clean and dry mixing container with lid
  • Measuring cup (optional)

A step-by-step guide to mixing oils

  1. Determine the amount of each oil needed based on the vehicle’s oil capacity and desired oil blend.
  2. Pour both oils into a clean and dry container.
  3. Secure the container lid and shake vigorously for at least one minute.
  4. Pour the blended oil into the vehicle’s oil fill port using a funnel.
  5. Check the oil level and add additional oil if necessary.

Tips for ensuring proper mixing of oils

  • Ensure that both oils are compatible and have similar viscosity.
  • Use a clean and dry container to avoid contamination.
  • Shake the container vigorously to ensure thorough mixing.
  • Check the oil level and color to ensure proper blending.
  • Consider having a professional mechanic mix the oil if uncertain or uncomfortable with the process.

Can I use 5W20 instead of 0W20 Toyota?

While both 0W20 and 5W20 oils have similar viscosity at operating temperature, using 5W20 instead of 0W20 Toyota recommended oil may not be ideal. The manufacturer determines the recommended oil viscosity for your vehicle based on factors such as engine design, operating conditions, and performance requirements.

Using a different oil viscosity than recommended may result in decreased fuel efficiency, increased engine wear, and potential engine damage over time. If you have concerns about using a different oil viscosity, consult your owner’s manual or a trusted mechanic.


Mixing 0W20 and 5W20 oils is strongly discouraged as it can harm engine performance, fuel efficiency, and emissions. Although mixing oils may seem necessary under certain circumstances, it is crucial to comprehend the possible risks and seek advice from a qualified mechanic before proceeding. It is always advisable to adhere to the manufacturer’s guidelines and use the prescribed oil viscosity for your automobile. By doing so, you can ensure that your engine runs smoothly and efficiently for many years.

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