And for those of you that have stopped to wonder why it is called "Seafoam."
"Seafoam was developed in the 1930s originally for the marine market, hence the name. Fred Fandrei, the founder of Seafoam, showed Evinrude Outboard Motors how to solve their stale fuel, varnish and carbon problems with its use. Because the product worked so well, and after many years of experimentation, Seafoam became a great problem solver in the automotive after market as well."
For a better history, check out
The Seafoam Story
For use in diesels, here is
The Diesel Engine FAQ
I use it in all my small gas engines, not in my diesel trucks or Garden tractor however...