answer from BMW:
BMW offers an Original Owner Protection Program. This program is not an extension of the original New Vehicle Limited Warranty, however, it offers mechanical breakdown protection and warrants against defects in materials or workmanship. To add this program to your vehicle, you must still be within the coverage period. This means your 2008 BMW X6 must be within the four years or 50,000 miles, whichever comes first, parameters. To learn more about this program, please contact the service team at your authorized BMW center.