Hi
Spanish second hand vehicles tend to be more expensive and usually have high Km. readings, if you buy from an individual make sure you trust them because like property you inherit any debts associated with the vehicle [ speeding tickets / fines / etc.]
I bought my car from a dealer in Espace de Mediteraneo in Cartagena, and touch wood it seems to have been a good buy, they handled all the documentation, We have had the car for 18 months now and it has just passed its ITV [MOT] which is every two years once the vehicle is 4 years old.
At the end of the day its BUYER BEWARE good luck