Originally introduced in 1975, the BMW 3 Series is a legend not only of the Bavarian brand's lineup, it's a staple of the entire automotive landscape! For years, the 3 Series has remained one perennially popular pony, eventually evolving into BMW's best-selling model. Take a peek at the clip below to learn why the 3 Series' flame is seemingly inextinguishable:
For 2015, the 3 Series can be had in either sedan or…