Just purchased a gently used 2013 BMW X5 50i M-sport package for my wife. On the second day, we noticed a rattling coming from the hatch, that is apparently pretty common. On the third day, when she started the vehicle, it shook and ran roughly with a "Decreased Engine Power" alert. Nothing like sending your "new" car right back to the dealer right after you pick it up. She's starting to miss the Sequoia we traded in.