The BMW 540i is a luxury performance sedan built by the German automaker BMW. It is part of the 5 Series range of midsize luxury cars and is powered by an inline 6-cylinder engine. It features a number of high-end features, including full LED headlights, LED fog lights, and a sport-tuned suspension. The 540i was first introduced in 1996, and it has since been updated several times with improved power, technology and styling.