2016 Mercedes E-Class Convertible. In the engine, the E250 Bluetec depends on a turbocharged 2.1-liter diesel-energized. The E350 has a 3.5-liter V6 that produces 302 hp. At long last, the E63 AMG S gets a turbocharged 5.5-liter V8 that wrenches out 577 hp 590 fp. The E400 packs a turbocharged 3.0-liter V6 that delivers 329 hp, while the E550 moves up to a turbocharged 4.7-liter V8 pumping out 402 hp. Convertibles bodys tend to flex with gear shifting. CLK 6.3 AMG Convertible flexed.