The SLK 250 is synonymous with the agility and compact aura typical of a fast roadster. Even though it is fast, the fuel consumption is quite efficient with notes varying depending on how you drive. A sporty and toned aura synergizes with agility, luxury and comfort. The Mercedes Benz SL Class was released in 3 editions. The three are SL450, SL550, and AMG SL63. SL450 uses a 3.0L V6 Biturbo engine w / Direct Injection, 362 hp capable of reaching an acceleration of (0-60 mph) 4.9 seconds.