dont know about settings in 3DS Max but in generell:
i put one light with 70-80% brightness and 50% shadow on top of the cars....
one with 70-80% and 100% shadow as a main light from side, front or whatever and a little fill light with 30-50% and 30% shadow and a little colour (bright yellow or blue) from the other side
i always use 3-4 lights for my scenes
i hope it will help you...but i think you need a 3D Max Guru to explain the setting for you...