Go for it, Insha Allah you will not regret...
Why you wanna buy a used car just to learn about vehicle's problems and maintenance. Get a brand new car, you won't have to engage and deal with problems. Just routine maintenance like oil/filter change thats it...
If you keep the car with care and regular maintenance it will be good for at least 5-7 years depending on your usage, and by the time you will know about getting its work done, as they say
Khuda jab husn deta hey,nazakat aa he jaati hey
And stay hopeful, Allah may bless you with a better and new car by then..