Think BMW, and the first model that usually comes to mind – for most folk – is the 3 Series. Ubiquitous, the model has been at the forefront of things from the get-go, and while the brand has evolved its lineup to incorporate a host of new segment models from the ‘easy-to-figure three-model’ range of the past to the ‘just how many of them are there, really’ of today, the 3er has been very much the standard bearer for the brand, the one by which it has been defined, and association measured. Since 1975, five generations and more than 12.51 million units sold attest to that.