As long as you aren't planning on doing any extreme oil change interval, there should be no problem with that.
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.
YES! "Regular" oil is what is mixed with synthetic to make semi-synthetic. Try to use the same brand. I've heard it's not good to mix the different additives that different companies use.
Vegetable oil does not mix with alcohol because the density of the liquids is different. This is the same reason that oil and water do not mix.
Because they are different liquids
yes
Different oil companies at different times and different regions of the country.
Sure, why not? I mean, there's nothing bad about it.
They have different Viscosities which does not allow the two to mix.
Oil and oil will mix.
When mixing 2 stroke oil , the oil to gas ratio should be on the bottle . Different brands of oil mix different . But the bottle should tell you how much oil to gas to get the 32-1 mix that you want .
To mix oil paint you have to choose the colored pigment and add it to the oil medium.
typically won't hurt it, don't make it a habit and change the oil asap