The SL is a luxurious two-seat convertible but not a hardcore sports car. It is made almost entirely of aluminum to save weight. Power comes from a 4.7-liter V8 that employs a start-stop feature designed to save fuel. The retractable hardtop has adjustable opacity to let sunlight in even when the top is raised. The SL is full of high-tech features and safety equipment: collision mitigation, adaptive brakes and cruise control, active head restraints, head-curtain airbags, and more. An entry-level 329-hp, twin-turbo V6 SL400 starts at "just" $85,000. For 2016, the 4.7-liter V8 engine gained 20 more horsepower. The SL gets a freshening for the 2017 model.