I have been using Eagle's new "tech" wax. It puts a great shine on, but doesn't last more than a month. I have used Mothers, Maguires, Zymol etc and they are all about the same.
I like the new Eagle wax because it doesn't leave any white stuff on the black plastic or rags. It comes off easily and doesn't dust up everything.
I had to chime in on this, because I see so many owners spend so much time and money maintaining their CTD's, and do little or nothing to keep them looking good. I read so many people comment about the money they spend on these trucks and upgrades and wonder why that is. When you go to sell/trade your truck, the first impression to the buyer is how it looks when they/you drive up.
Don't get me wrong, I have done many upgrades to my CTD to make sure the motor/drivetrain is performing flawlessly and am meticulous about maintenance intervals. I just prefer that it look as good as it runs.
I typically wash my truck once a week and detail it monthly. I spend an average of 80hrs a month behind the wheel, so I like it to look good inside and out.