I bought a used VW Gol many years ago from a big dealer VW dealer Dietrich, they did all the work for registration, verifying fines, mileage, transfer of title, and cuil registration. Just deposited cash pesos in Dietrich's local bank account. The car was under warranty for 6 months. For a newcomer with limited Spanish I don't recommend buying from private party.
Encontrá tu próximo VW en Volkswagen dietrich. 0 Km, Planes Autoahorro, Taller, Repuestos, accesorios y ventas corporativas
vw.grupodietrich.com