its the same process as changing synthetic oil, except you use regular oil.
Synthetic oil or a blend of Synthetic and regular oil is much better for your vehicle than regular oil alone. Synthetic oil is MUCH more expenshive. If you change your regular oil every 3 months or 3,000 miles I will be fine.
Yes
Oil changes are always necessary. If you mean can you mix conventional oil and synthetic, the answer is yes you can.
Synthetic. Turbos should always be synthetic.
3000 miles if using regular oil, 6000 if using synthetic. I use synthetic for my RSX-S, but regular would do for a base model.
Either as the choice is yours. If you use synthetic then extend the oil change interval by 2,000 miles.
As the additives wear out and the oil ages it will change to a dark brown color just like regular oil
Yes, there is no harm in switching back and forth.
No, you can mix them together if you so wish. But know that you cannot extend the oil change interval if you do not use 100% synthetic and should change the oil/filter every 5,000 miles.
Yes, you can. It is even sold as a Synthetic Blend.
I will change my oil from conventional oil to synthetic oil on my next oil change.