Advice for buyers
What should I look for in a used BMW X5 4x4?
Apple CarPlay is an option on the X5 (many of the X5's major competitors have CarPlay included as standard), so make sure yours has it fitted. Otherwise, you can have it retrofitted for a one-off fee.
Other than that, the X5 is still an enormous SUV with big alloy wheels to match, so inspect each rim carefully for kerb damage since repairs will be costly.