I really have to agree with most people here, I really wound not buy a used car, unless you know the people you are buying it from and the history of the car.

I used to lease a car - easy no problems.

I now have bought my own car - but a suggestion is that you buy a make that has a good resale value in Qatar for when you leave.

Really would stay clear of used cars and definately those of the 4x4 variety.