The new third-generation BMW X5 will be sold with a 2.0-litre four-cylinder diesel engine in some markets and optional rear-wheel drive in a move that endows the SUV with better fuel efficiency.

The new BMW X5 has its planned public debut at the Frankfurt motor show in September.

The decision to expand the choice of engines to include a four-cylinder unit mirrors the move made by Mercedes-Benz with its latest M-class. However, BMW's decision to offer rear-wheel drive represents a first in the hotly contested luxury SUV ranks. 

Developed under the internal codename F15, the new X5 has been progressed in a typically evolutionary approach that sees it retain its upright profile and traditional features such as its two-piece tailgate. Distinguishing touches include a bolder front end with a more prominent kidney grille and LED-imbued headlamps that butt up against the chrome surround of the grille.