Should the four-door sedan one day go the way of the dinosaur and its history written in full, there’s liable to be a whole chapter on the BMW M5. The high-performance version of the 5 Series has, arguably, defined the concept of the sport sedan for generations — and arguably is the right word, because few production cars have generated as much controversy among fans with each generation as the M5. 

Over the span of its 40-year history, however, a few things have generally remained true: each subsequent M5 has been more powerful; each subsequent car has been more expensive; and, perhaps most controversially amongst its legions of fans, each new version has been larger and heavier than the one before. (Of course, that’s not the only source of strife to affect the M5 over its seven generations, but we’ll get to that in a bit.)

The M5 is also still very much alive and well; there is even likely the wagon version coming to the U.S. sooner rather than later, the type of gift to certain enthusiasts that it feels like you see less and less of these days. We’ll probably still be talking about the M5 40 years from now, in other words, as we have for the past 40.

So walk with us, then, as we survey the four decades and seven generations of cars that have come to make this otherwise unremarkable alphanumeric moniker one of the most celebrated names in the automotive world.