The BMW X5 (F15) represents the third generation of BMW's benchmark luxury SUV. Built on a heavily modified version of its predecessor's (E70) platform, the F15 brought significant improvements in ride comfort, interior quality, aerodynamics, and infotainment (introducing iDrive 4.0, later updated to 5.0 and 6.0). While it lost some of the raw, heavy steering feel of older BMWs in favor of electric power steering (EPS), it became a much better daily driver and family hauler. It also introduced the first plug-in hybrid X5 (xDrive40e) and a rear-wheel-drive only option (sDrive) for certain markets. Overall, it is a highly capable, luxurious, and technologically advanced SUV, but its reliability heavily depends on the chosen powertrain and maintenance history.
The BMW X5 F15 is an outstanding luxury SUV that hits the sweet spot between modern technology and traditional BMW driving dynamics. If you are buying one today, the inline-6 engines are the only way to go. The petrol xDrive35i is highly reliable with basic preventative maintenance, and the diesel xDrive30d / xDrive35d is a masterpiece of torque and efficiency (provided the EGR recall is done). However, buyers should avoid the V8-powered 50i unless they have a comprehensive extended warranty, as the N63TU engine remains a financial liability. The PHEV (40e) is only recommended if you do mostly short city trips and can verify the battery health. Regardless of the engine, budget for rear air suspension replacement and transfer case fluid changes.