San Juan is a city in Argentina and is the capital and namesake of San Juan province. The Ruta Nacional 40 passes through it.
South towards Mendoza
Take the Ruta Nacional 40 southward. There's a gas station named Oil (yep, it's a brand) about 15 km south of the city center. Try to take a city bus to Villa Krause or even better, Villa Nacusi. Please add more info (like a city bus number) if you have it.