mytan,
I just turned in my leased 02 540 (extremely reluctantly) Mine had 48k miles and while researching the possibility of buying it out at the end of teh lease, was advised by both my BMW dealer and BMW Financial that the cost would be approximately $3,200.00 and that they would have needed to inspect the car for the extension of the warranty to 60k miles. I turned the car in and leased an 05 545.
Marco
Hope this helps.