Never one to hold anything back, Mercedes-Benz's all-new 2013 SL is the ultimate German-built gran tourer.Only yesterday did we publish some leaked (but official) photos of the new 2013 Mercedes-Benz SL. And now, not surprisingly, the German automaker has revealed full specs and even more photos of their long-running (six decades) grand touring convertible. The 2013 SL features a new aluminum body shell that weighs around 242 pounds less than it would have if it used the steel technology of its predecessor. This aluminum structure has even greater rigidity and improved safety combined with low resonance and vibrations.Powered by a new 4.6-liter V8 with 429hp - a 12 percent increase over the previous engine - it has 391lb-ft of torque along with decreased fuel consumption. The engine also features an ECO stop/start function as standard and is mated to a seven-speed automatic slushbox. Performance wise, the SL550 can go from 0 to 60mph in just 4.5 seconds. As with previous generations, the sixth generation SL has been designed to be "a stylishly sporty and elegant luxury sports car with balanced proportions that are classic SL." Examples include the long hood, compact passenger compartment, and a wide rear end.