For black the best is Pinnacle Souveran Paste Wax. It really makes a black or dark color vehicle shine.
On the down side it's expensive stuff and requires frequent applications. They recommend first using Pinnacle Paintwork Cleansing Lotion to polish and clean before waxing.
I suggest using some of the more 'professional' companies like Meguiars, Mothers, or Pinnacle, before using Turtle Wax of Armour All products.
With a black finish it's going to show any scratches, etc.
Check out
www.properautocare.com for tips, etc.
Dave