Are there certain questions to ask oz or can it be about almost anything?
It's just lore since theres no real directions in game of what to ask so it doesn't effect things apart from some dialogue referring to some (think it might just be one thing).
Very few, but they don't affect the story aside from providing more insight for the keen.
Not anything, but he will answer some specific questions. For example, ask him "Do you like bacon?" and see what he says. Sorry if its a spoiler
