Usually Tri Coats.
or paints requiring extra steps its seems.
I know my sisters 2007 Lucerne had an extra cost paint...... Sharkskin
It really is a nice color. You see it and its like a metallic grey. If you walk by it and the light reflects off it-- the paint turns colors.....
Here is a pic I found online of a Lucerne with Sharkskin---- note the hood edge is reflecting a purple color.
Ive seen purple/green/reddish