Thanks for your question, and a quick answer is yes, you can mix 0W-20 and 5W-20 engine oils. It’s not recommended to do it, but you can. If you are mixing them in the same oil container, it will turn into a 3W-20 viscosity grade.

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There are some things you need to consider when mixing different oil viscosities –

Can I mix 0w20 and 5w20?

There are benefits to mixing 0w20 and 5w20: the lower viscosity provides better protection in cold temperatures, while the higher viscosity offers better protection in hot weather. 

The downside of mixing the two is that it reduces fuel economy by about 2%. There are risks associated with mixing 0w20 and 5w20, as well: some manufacturers recommend against using less than 15W-50 motor oil for certain engines.

If you’re unsure about whether or not your car can handle a lower viscosity oil, consult its owner’s manual for more information.

The first is viscosity

The first is viscosity. The second is the additive Package. The third thing is the base oil. The fourth thing is the additive Package. The fifth thing is the base oil. And then it repeats again for a total of six times, but in reverse order:

• Additive Package = Sixth (1) on each side of your equation
• Base Oil = Fifth (2) on each side of your equation

The second question is about the additive Package:

The second question is about the additive Package:

• A good additive package will be designed to work together, and it should be compatible with all viscosities.
• Some additive packages are designed to work with a specific viscosity (for example, 0w20 or 5w20). If you mix these two types of oils, they may not work well together in your engine.
• Some additive packages are designed to work with a specific brand of engine oil (for example, Amsoil). If you mix the wrong additives or change brands, again, it could cause problems for your engine’s health.
• Finally, some additives packages are specifically for gasoline engines or diesel engines; mixing them could cause issues since they’re not meant for each other.

Diluting the additive Package of the oil you are adding to the engine.

The thing you want to avoid when mixing different grades of oil together is diluting the additive Package of the oil you are adding to the engine. 

The additive packages are designed for a specific grade, and lower grades won’t have enough of those additives in them to keep your engine running at optimal performance levels. 

If you’re unsure, consult your car’s owner’s manual to determine whether it is OK to mix different grades of oil in your vehicle.

Conclusion

You are to follow your vehicle manufacturer’s recommendations on what kind of oil to use based on its specifications sheet, which should provide details about what viscosity should be used.