Definitely a render, the lighting is all kinds of wrong.
Could be used in a game? Yes.
A Blitz game? Not unless you mean with one of the more powerful third party engines, no.
Without killing performance? Well, depends on the machine specs. To have a game with cars of that quality, you're going to be talking a lot of polys being rendered and a pretty heavy duty shader to get those kinda paint, reflection and lighting effects, so you might get decent performance if you set the minimum specs up ( insanely? ) high.
Could be used in a game? Yes.
A Blitz game? Not unless you mean with one of the more powerful third party engines, no.
Without killing performance? Well, depends on the machine specs. To have a game with cars of that quality, you're going to be talking a lot of polys being rendered and a pretty heavy duty shader to get those kinda paint, reflection and lighting effects, so you might get decent performance if you set the minimum specs up ( insanely? ) high.