On the last episode Ziva rolls into the lot in a Camaro.
She told Tony she is starting over since the passing of her father. Tony had wanted the car but she sold it to a friend of Magee's since all of Tony's cars get destroyed in some fashion and "she loved her MINI"

I thought she just didn't want to hear him whine when his struts mushroom, his timing chain and tensioner are replaced, his turbo oil line leaks, he walnut blasts carbon build-up, or he has to pony up for a new turbo. Yea, Tony is to tight to own a mini.