Yes, as long as you are using the correct coolant as recommended by the vehicle manufacture.
no
Don't mix Dex-Cool with other types of coolant. You will be asking for trouble and paying a premium to get it. See link.
you always should mix coolant with water if it is full coolant. most coolant today says 50/50 on the package and is pre mixed in which case no, but if it is straight 100% coolant, yes mix with water.
50/50 mix of water and coolant is recommended.50/50 mix of water and coolant is recommended.
You should not mix colors or brands of coolant.
most coolant is 50/50 mix. however in arctic climate it is 50/70 mix
Oil and coolant should NEVER mix in an automobile. Can you be a bit more descriptive in your question? Im led to believe there is something wrong with your vehicle. I agree with him, if you have what you call a mix of coolant and oil on the valve cover you have an internal coolant leak you need to get looked ASAP. Oil and coolant do not mix anywhere, it's like if you put oil and water in a jar and shake it, it seems to "mix" but it really doesn't and it will separate when left alone. If you get too much coolant in the oil, it will take away the lubricating quality of the oil and it will ruin the engine.
Ford sells green colored antifreeze also , I don't believe you should mix the 2 colors
Best to use the Honda coolant 50/50 mix.
Water should be fine, but mix it with coolant when you can to prevent rust from developing in the radiator.
About 2 gallons of 50-50 mix of concentrated coolant and water.
Antifreeze should be a 50/50 mix with water. If you bought pure coolant, mix with water. If you bought premix (already 50/50) pour in straight.