Welcome to the forum!
1. Shell Rotella T6 IMO.
2. Any, just keep the stock manifold. Prodrives are nice, if you can score a set.
3. Wipe, dip, look.
seriously though, what's the problem you're having?
4. You will blow your motor. Seriously, don't even joke about that.
5. BOV will not give you power. The GFB hybrid one is my favorite, sounds good and keeps the ecu happy.