No, you could mix with synthetic blend but its not recommended.
Yes, that is what a synthetic blend is that they sell.
Synthetic and conventional oil can be mixed and used with no problem. That is exactly what a synthetic blend that you can buy is. A mix of synthetic oil and conventional.
That's okay.
Yes you can. In fact they sell Synthetic blends.
You can mix part synthetic oil with full synthetic oil.
Yes, you can also mix it with conventional oil creating a blend.
Who told you it is not recommended? You can mix synthetics as long as they are of the same weight. You can even mix synthetic with conventional oil.
Yes, you can. It is even sold as a Synthetic Blend.
It might be... It's highly not recommended to mix regular and synthetic oils.
Any name brand 10w30 would be fine. Don't mix synthetic and non-synthetic oils.
Yes you can mix different brands but I recommend you do not mix different weights. You can even mix synthetic oil with conventional oil. But as the weight of the oil is critical, do not ever mix one weight of oil with another, no matter if it is synthetic or conventional oil.
ppt of non petrochemical synthetic fibers