"You have to submit your product for testing to a specific research center located in the southwest who (for a major fee) will test your product and pass on results to DOD No one can afford the cost and of course there is no guarantee you will get an order."
A little clarification is in order here as the above in not correct. The DOD Guidelines identify a series of laboratory and then engine/component tests. They do not specify Southwest Research Institue or any of the other independent laboratories. That is left to whoever wants to have the tests conducted. Now these tests are comprehensive as fuels and engines oils are used in not just administrative vehicles but everything from soup to nuts that includes combat, tactical, engineering, amphibious, etc. With a fleet that mixed and exposed to vastly differing operating conditions, one needs to be sure that whatever is going to be added to already qualified engine oils and the likes, there will be no problem. That is why there is a need to demonstrate that when using aftermarket additive xyz, it doesn't screww thing up. Likewise, the testing has to show that it also IMPROVES whatever it claims to do. The improvement cannot be established by single car tests (much like what some of the posters cite), but documented tests that have controls as well as test vehicles.
Now about the comment that Slick 50 was tested by TACOM, the only product that slipped through was something call ECO KAT Fuel Energizer that some friend of a two-star general convinced the technical director to evaluate. Well it was tested of sorts and came out as a flat zero.