No experience with Evans but here is what Evans Waterless NPG+ coolant is (NPG stands for Non-aqueous Propylene Glycol):
30% Propylene Glycol mixed with 70% Ethylene Glycol (regular coolant base)
http://www.hrpworld.com/client_images/ecommerce/client_39/products/pdf_3415_3.pdf
You may buy it through DieselSite.com for...wait for it...$30.50 per GALLON...but...because you don't add water to this you have to buy SEVEN gallons for a system fill after a very thorough flush and sufficient ventilation to allow the system to DRY OUT - you don't want any water remaining in the system (difficult to achieve).
As a coolant, Evans gets around the corrosive properties of water by eliminating water and since the propylene glycol has a higher viscosity than water, that addresses the issue of cavitation as well. These are two components of concern in diesel engines especially with mixed metal construction...BUT WAIT...
It is flammable too. It auto-ignites at 1055 degrees F. While it is unlikely that your coolant will get to 1055 degrees (your engine block melts before this happens in all likelihood) if you have any coolant drip onto the exhaust manifold...you know right UNDERNEATH the coolant bottle?...it could catch fire because your exhaust manifold does get to 1055 degrees F from time to time.
Since I've never used it I can't say definitively how it would perform in the oil cooler. While at least theoretically with no elements to produce debris it seems like a good concept, I'm not prepared to put a potentially volatile in a system sealed less fully than the fuel system.
The 6.0L like most vehicles uses a pressurized cooling system (16psi cap) to keep the coolant from boiling. With Evans you wouldn't need a pressurized cooling system but I am not sure how you would eliminate the pressurization...maybe the system just doesn't pressurize because there is no water to liberate from the mixture into steam? That is probably it.
It's oily too so many performance sports venues do not allow its use (or regular coolant either...only water at those sites).
I got my VC-9 from K-Mans Sports:
Motorcraft diesel engine coolant system iron cleaner VC9
Hope this helps get a start for your answers. I too would like to hear more on this but I'm not going to advocate this stuff...seems too risky to me for a 6.0L from a safety standpoint - I'm not doubting any claims just the application in a 6.0L as prudent.
Jonathan