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Since you also asked about 650s, my CPO expired 2 years ago this month. In that 2 years the only issue was the crankcase vent lines that are under extended warranty, but I did myself anyway. Other than that, just oil and air filters in the last 2 years. While under warranty since I've owned it the dealer replaced 2 balky iDrive controllers and the little rear convertible window because one of the defroster wires stopped working. Those are the only repairs in three and half years. I'd say that's reliable, but as far as I know my 2014 X3 has never had a repair of any kind. Not even a burned out bulb.
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