If you don't carry a spare, you won't need a jack. The scissor jacks always worked for me, but have not used the BMW versions. For full preparedness, you may want their space saver kit, with a full set of tools nested inside the center of a space saver. If you look here you'll find links to it; just be sure you have it tied down really well, loose wheels bouncing around the cabin are a drag in an accident.
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