Yes you can. Contrary to a popular belief it does not hurt to switch between or mix synthetic and conventional oils.
You can blend synthetic ATF with conventional ATF.
You can use synthetic, synthetic blend, or conventional oil. It is your choice.
Yes, you can also mix it with conventional oil creating a blend.
It is a combination of synthetic oil and conventional oil.
No. You can use conventional, synthetic, or a blend.
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.
Castrol Syntec. I recommend when switching to synthetics from conventional, that you run a synthetic blend for 6,000 miles (two oil changes) then change to full synthetics. If you have no experience with changing oils (especially changing from conventional to synthetics) I do not recommend you attempt this.
Yes, semi synthetic is a blend of synthetic and conventional oil already.
10w30 or 5w30 conventional , synthetic blend, or full synthetic will do
5w30. It can be synthetic, conventional, or a blend.
5W20. It can be synthetic, conventional, or a blend.
No, Saturn recommends that you use SAE 5W-30 conventional, synthetic, or synthetic blend. Use no other weight.