Wow, what a shame you have had such a bad experience. You must have taken a nasty hit to make this trade, I hope it is worth it.
Personally, I have not experienced any of these issues (4,000 miles 3.0si) and feel I have a solid vehicle, that I look forward to driving every day.
If the dealer offered me my full purchase price back to trade this in, I would decline...I am that satisfied.

Very sorry you have had such a bad experience, but it sounds like you have a lemon....hopefully someone else does not buy this back from the dealer and have the same experiences. But, then I guess that is exactly what is going to happen...shame your X cant go back to the factory.

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2013 X5 35i M Sport