You need to get the 3rd row seats to get the auto leveling rear suspension in the 6 cylinders (at least in the US). The V8 comes with it automatically I believe. In Europe, you can order it separately (which is the way it should be).

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1995 BMW M3 (Track prepared)
2006 BMW 530xi (Wife)
2011 BMW X5 35d (Tow/Daily)