Can You Mix 5w30 and 5w40 Oil?: A True Answer
Both the 5w30 and the 5w40 are the two best engine oils. They are compatible with most engines, and you can alter them accordingly. If you have any of them, you can use them in your engine. Can you mix 5w30 and 5w40 oil? Yes, you can. But the fact is you need to find out the perfect place to use and mix them. You cannot use the mixture for all the engines.
Therefore, you must know how to properly use the 5w30 and 5w40 oil. You cannot make any mistake in mixing them properly; otherwise, they might destroy your vehicle’s engine. So, you must check the compatibility and ensure that the mixture is perfect for your car’s engine.

Uses of 5w30 & 5w40
5w30 can be used in temperatures ranging from high to low. 5w30 oil is an excellent option if you drive your vehicle in an area that experiences significant temperature shifts throughout the year.
Using 5w40 oil is beneficial to diesel engines. 5W30 motor oil is suitable for use in today’s gasoline-powered vehicles. This fuel is economical and has a low viscosity, which makes it appropriate for today’s gasoline engines and offers it a high degree of efficiency in terms of fuel consumption.
Can you mix 5w30 and 5w40 oil?
You can mix 5w30 and 5w40 oil. They can still provide the necessary viscosity and lubrication to the moving parts inside of your engine. They are engine oil of the same grade. They can be stronger together. Both 5w30 and 5w40 can operate in extreme hot or cold conditions. So, if you mix them, their performance won’t be affected. Also, your engine will be just as fine. But you should avoid using them consistently.
How to Mix 5w30 with 5w40 Engine oil?
You can use one liter of 5W30 mixed with one liter of 5W40, and the engine will not be harmed.
When an engine is cold, the motor oils have a grade of 5, but at operating temperatures, the 5w30 oil has a grade of 30, and the 5w40 oil has a grade of 40. The 5w40 has a higher viscosity than 5w30, when combined with the higher summer temperatures, contributes to the car’s ability to function correctly.
It is recommended to vary the proportion according to warmer or colder seasons. Since 5W30 is lighter than 5W40, it has a lower impact on the engine’s overall performance. If you want to make the mixture cost-friendly, add more 5w30.

Is it safe to mix different engine oil?
It is safe to mix different engine oil. Combining various engine oil will have no adverse effect on your vehicle’s engine. When different types of oil are combined, there is no risk of producing unwanted by-products, and the engine’s performance will not be affected.
What’s the best engine to use 5w30 & 5w40 oil?
The viscosity of 5w40 is higher than that of 5w30. Therefore, 5w30 is preferable to 5w40. If we compare the two in terms of how efficiently they burn fuel, we find that 5w30 is more fuel-efficient than 5w40. Looking at the price of both of these motor oils side by side, we find that 5w30 is significantly more expensive than 5w40.
Are 5w30 & 5w40 compatible?
5w30 & 5w40 are compatible. 5w30 and 5w40 can be used together. You can switch between them. When it comes to thickness, they are about the same. If you consider how well they work, there isn’t much difference between these two either. Using one engine oil instead of another won’t hurt your engine.
Closing Words
Can you mix 5w30 and 5w40 oil? Although you can do it, you cannot always safely use the mixture. Sometimes, you can safely mix these oils, but it will not give you an efficient result. You must use them separately without any emergency. If you don’t have any option to use the same oil, you can mix and use them.