Nice. I also have a 2011 35d that I bought in November 2014 with 71k miles. It now has almost 77k. So far so good and it's a real pleasure to drive. Once it warms up I'm going to change all of the drivetrain fluids. I just changed the oil for the first time and had a sample analyzed by Blackstone. It looked good and I put Castrol Edge Professional OE 5W30 in it.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim