Finding information on this exact model car is difficult. The Wikipedia page does not say when the exact first CLS550 model was released. The closest answer would probably be 2010, because it seems to be impossible to find any models released before that.
Roadfly TV - 2005 2010 Mercedes-Benz CLS 550 5-51 was released on: USA: 13 August 2010
Yes.....
8 cylinders ann 380+ horse power
CLS in Mercedes means : Coupe Long Sport.
Mercedes-Benz CLS-Class was created in 2004.
Mercedes is real good about putting that info in the owner's manual. I have a 2007 CLS 550 coupe and all that info is available in the manual(s).
The 2012 Mercedes-Benz CLS-Class has a V8 engine.
The 2010 Mercedes-Benz CLS-Class has a V8 engine.
The 2014 Mercedes-Benz CLS-Class has 32 valves.
The 2008 Mercedes-Benz CLS-Class has a V8 engine.
The 2011 Mercedes-Benz CLS-Class has a V8 engine.
The 2014 Mercedes-Benz CLS-Class has a V8 engine.