There is no chance 2011 508 engine will work efficiently with bad cooling. Only exact type of antifreeze will suit Peugeot 508 cooling system. Before choosing fluid note that engine code 5FS (EP6C) and volume of 1.6 were installed to your car in 2012. For filling up the system you will use 6 liters of special Red coolant type. Make sure you service system at Peugeot with installed 2.0 engine correctly.
There is an important thing for 4HL (DW12C) engines of Peugeot’s production – they expect good service. Produced in 2011 the 2.0 engine in 508 model will serve longer by this. To endure car life take only Red antifreeze and pour not more or less than 6 liters. So better use Peugeot’s advice for servicing 2013 508.