My parents bought me a car which they pay intest on the car till now. Is it permissable to continue using the car or not? because they pay the financing.

Praise be to Allaah. 

So long as the purchase with interest has been made
and it is not possible to go back on that, you can use the car, but you
must advise your parents and explain to them that ribaa is haraam, so that
they will not do this again. And Allaah knows best.