Can you mix 10w30 with 5w30?
Now, as far as different grades are concerned, mixing between them isn’t something that will damage your engine either.
Thereof, can you substitute 10w 30 for 5w30.
5w30 and 10w30 are both 30 weight oils and the exact same thickness in your engine when it is at operating temperature..
Is 10w40 good for high mileage?
A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil — 10W — can help protect worn engine bearings as well.
Does brand of oil matter?
No. Switching brands is not harmful to your engine as long as you choose an oil marked with the API donut of the same level, e.g., API SN. Motor oil manufacturers must meet minimum industry standards for performance and compatibility of the API mark.
Is it OK to mix different viscosity oils?
THE ANSWER IS NO! Even if two different brands of oil have the same viscosity, you still should not be mixing them together.
Is 5w30 better than 10w40?
The main difference between the 5w30 and 10w40 is the viscosity difference at different temperatures. … The one, 5w30, will be able to flow better when the temperatures are low than the 10w40. So at a lower temperature, the 5w30 oil will be the best to protect the engine.