Paraguay TIP is three month renewable two times by the owner (or somebody in the owners name with a 100 USD bribe). You can leave the country without the vehicle.Customs officers dont always give you an importation paper. If this is the case, i assume you can leave it as much time as you wish, but you ll have to bribe every time you are asked this paper by police (very few of them know the customs rules). You can also cross the Paraguay river on a small boat, it s a funny and thrilling experience and then go to the closest border on the other side.

I never tried to leave Bolivia without my vehicle but there is no trace of a registration in the passport. I crossed the border back to Argentina in 2007 and came back to Bolivia from Brazil in 2008, and the customs officer there mentioned i left my vehicle in Bolivia the previous year. The border in Bermejo failed to register my depart. It was solved by phoning to the customs office in Aguas Blancas. So vehicles are indeed traced, but this doesnt mean you cant leave within the time authorized and come back. 2 years ago i was given 6 month for the vehicle and the usual one month renewable two times for me.

I just got confirmed by a public lawyer friend of mine here in Buenos Aires that the law didn t change, it is still up to 8 month. The guy that got 3 month just got unlucky (so did I a few years ago in Clorinda). The mistake was to generalize based on a perticular case.