Need Help Buying F15 2014 BMW X5 xDrive50i

[JonK]

I've been looking at local listings last few months.
Is it good Idea getting high mileage 60k mi X5
I like the price that's under 40K and local listing.
First off, I know repairing V8 is costly and nightmare,
a friend told me they got their shit together on their V8 since 2014
I currently drive fully loaded 2016 550i, I love the engine and I figure similar interior might be plus.
I did own E53 with naturally aspired 4.4i, yes it was a nice ride but was crazy expensive to fix little thing as tiny leak. Now with bi-Turbo just getting to the engine seems to be nightmare.
If I get these where shall I get extended warranty?
Help please

Dealer's Price: $36,900
Mileage: 59,388 miles
Transmission: 8-Speed Automatic
Exterior Color: Carbon Black Metallic
Interior Color: Black
Gas Mileage: 14 MPG City
22 MPG Highway
Engine: V8
Drivetrain: All-Wheel Drive
VIN: 5UXKR6C57E0J73738
Stock #: 80449A
Major Options: Sport Package, Leather Seats, Sunroof/Moonroof, Navigation System, Alloy Wheels, Bluetooth, Backup Camera, M Sport Package
Dealer's Description