The New BMW M550i Keeps Its Cool in All Conditions

It’s been more than three decades since BMW first put an M badge on its midsize 5 Series sedan. The initial M5, known to enthusiasts as the E28, made 280 hp from a 3.5-liter inline 6-cylinder engine. With less than 2,200 examples produced, it is considered one of the rarest production cars in BMW’s portfolio.