When it comes to the BMW sports car, the brand has a history of innovative design. The BMW Z4 first appeared in 2009 as a water-cooled, shaft-drive model with three or four cylinders mounted front-to-back. It was followed by the F and G series, which were chain-driven, and were powered by one or parallel twin Rotax engines. The M and X5 are now BMW's top-selling vehicles, and … [Read more...]