Buying a used car to take a long trip in a foreign country is a very risky
thing. What do you do if the car you buy from some stranger breaks down
a few hundred miles into your trip and needs costly repairs? What do you
do if you're stuck out in the middle of nowhere and the only mechanic in
town wants to rip you off for repairs you can't do without? Renting a car
may be expensive, but if your userd car needs repairs, the cost of the
rented car becomes much less than the used car plus you don't have to
wait around for a rental car to be fixed usually, you just get a
replacement and let the rental car agency worry about the repairs. And
there's also the insurance which seems really doubtful to me that you can
get like you think you can.
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My opinions are all mine. They do not reflect those of my employer.