For 2016, the Mercedes-Benz E-Class gains a new model, the E400. Powered by a twin-turbocharged 3.0-liter V6 engine, this model replaces the V8-powered E550 sedan. The E550 Coupe and Cabriolet, however, remain in production with the E400 Coupe and Cabriolet replacing last year's E350 models.