Attached Link: Car Paint Material


Here's a material you can use. Take it apart and see how it was created. Most realistic car renders get highlights from the REFLECTIONS, not the SPECULAR HIGHLIGHT. So, a good HDRI map is important :-)

Or, as in the scene above you can use a luminous lightbox object (not light panel) above the scene and reflect it off the top of the object-- like they do in the real world.