I don't find a problem with blind spots on the X6. I mainly drive a X5, and it isn't much different than the X6 besides the rear glass. I have my mirrors adjusted so they slightly overlap rearview mirror, that way I still have an idea of what I'm looking at. It isn't optimal as I haven't eliminated all my blind spots but a quick turn of the head for cars right next to my doors cures that blind spot.

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