Portillo Argentino is a passage at an altitude of 3,400 metres, about a hundred kilometres from Mendoza in the department of Tunuyán. You'll find Portillo Argentino on the route to Portillo Piuquenes, between the Scaravelli and Real de la Cruz refuges. This trail was used by General San Martin and his troops 200 years ago during the war for the liberation of Chile from the Spanish yoke.
If you want to explore the marvellous panorama of the Andes and Portillo Argentillo, I recommend you take a trek on foot or on horseback. You'll leave Mendoza by car and when you get Manzano Histórico you'll climb on your horse, or put on your boots! It's up to you which! You should allow about 4 days and 3 nights in the heart of Andean nature. Nights are either in a refuge or in a tent. That's also a question of preference...