Ethylene Glycol
Propylene Glycol
Water... (Mostly due to it being hydroscopic I expect)
And <2% of some anti corrosion product.
So unless that 2% is magic beans I think the article is very relevant however this might be more appropriate:
http://www.norosion.com/evanstest.htm
Of course it has been done by another manufacturer so who can guarantee it's accuracy but it certainly Seems legit to me.
I've read lots of good and bad about it, the marketing was handled by another company, not unusual but apparently it's hard to get any technical and sometime definitive answers from them. A lot of the well known people using it will also no doubt not be paying for it, or getting paid for it. Pretty common too, how many race drivers actually drink Monster...
Not to say it's completely useless/junk maybe that was a little harsh, however what you gain in it's resistance to boiling at hot spots is also lost in efficiency to remove heat at the radiator, not a 'cool' thing at all. I think overall its performance would be very cooling system dependant. This especially true if a car has a radiator sized on the barely adequate side (like a Cento
), it would almost certainly cause issues.
I would say ultimately your cooling system will run best on what it's designed to run on. Maybe if it's designed to run on Evans you would see a decent improvement, otherwise I'd leave well alone. I notice a few of the Aeroplane manufacturers specified it in some of their new engines for warranty. I also read chaps who tried to run it with their older engines had worrying temperature issues and soon went back to the standard mix.
Also lets not get on to the price now we actually know what 98% of the ingredients are...
For practical reasons not being able to top up for loses with water would be a pain, also getting burnt by it would be like comparing water to jam (neither pleasant but give me water every time).
I'm not convinced myself and will be staying well clear, at least until we have systems designed specifically for a relatively pure/concentrated Glycol product to be used from the factory.