Hi Henri, There are a lot of Argentinos....and We have a server in Argentina...low ping and best service for us. and.....I like to invite to them. Here.... http://clubsimracing.foroargentina.net/t264-campeonato-anual-dtm-2016-lanzamiento-e-inscripciones They are the Argentinians that I want to invite,
Your best bet today is to start your own Discord/Mumble or TS channel and manage your friends there but it can be hard if you don't know the guys directly. There's no messaging system in game today and I don't know what the future will hold but I can look into this and see what the devs say. Otherwise start a forum thread on Sector3 Forum under Leagues and Communities that you're seeking Argentinians to race against and that you'll host a server or something like that.