2016 Buick Cascada drops top with compact convertible

If there's one thing Detroit in January needs, it's a new convertible, but GM couldn't resist bringing the new 2016 Buick Cascada drop-top along to the show. The 2+2 has a soft-top, rather than the more fashionable retractable solid roof other convertibles sport, and is a rebadge of the Opel Cascada already available in Europe. That includes an engine perhaps …