Get a warrenty other weise look for a dealer that can provide a warrenty even if its hard/impossible to find. Maybe you should look on a newer one with warrenty.

Or be prepaired to by an enthustiast and order a bently manual before you pick it up so you can read up on how its build so you can trouble shot smooth when problems occor.

And if you depend on a runing car, buy a second one for the days that the x5 wount run.