Many of your questions aren't really objectively answerable, which is probably why your post got no response.
1. We can't tell you that. We have no clue what condition your car is in. Take it to Carmax. You'll often get the best deal there.
2. "Safe" is subjective. Get a Carfax and have an independent inspection done.
3. Depends on the car. That's the risk you take buying used. You have no clue how it was driven previously.
4. Advice on that subject exists all over the E60 forum.
5. Isn't a question.
6-8 you'll get quick answers from by going to a dealer. Too many variables are missing from your question (miles, years, etc.)
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