Before choosing fluid note that engine code M156.984 and volume of 6.2 were installed to your car in 2011. To maintain cooling system you need 0-0 liters of Green coolant. In other way 2010 CL won’t be used quite long and efficiently. For Mercedes-Benz CL it’s important to have optimal antifreeze inside. Make sure you service system at Mercedes-Benz with installed 5.5 engine correctly.
Use your 6.0 engine longer in 2005 CL by keeping these rules. So, don’t choose different from Green coolant and obey the number of 0-0 liters. There is a big plus in servicing 2013 Mercedes-Benz CL with all regulations. A lot of M156.984 motors are used long in Mercedes-Benz cars but only with good service.