Well everyone.....sorry to piss on your parade, but I am literally an antifreeze chemist. I analyze & test antifreeze from competitors and invent new antifreezes for a living. I supply the largest antifreeze manufacturers in the world and many other small ones you've never heard of. I've done extensive testing on Evans, Water Wetter, you name it...I've tested it.
First, I will begin with, "What's in antifreeze?". This is a very basic overview & not 100% correct, but it makes the point. Antifreeze is roughly 45% water, 45% ethylene glycol & 10% corrosion inhibitor & misc. additives. Water conducts heat (cools your engine) WAY better than ethylene glycol (NASCAR uses only water + corrosion inhibitor). The problem with water is that it freezes & it causes metals to corrode (rust). The ethylene glycol is added to prevent freezing & the corrosion inhibitors are added to prevent rust (copper, aluminum, brass, steel, cast iron, solder are the typical test metals). Most antifreeze tests very well against preventing corrosion vs. all of these metals, though some may be slightly better vs. aluminum & others slightly better vs. cast iron....but all pretty good.
Any by the way, color means NOTHING. It's just a dye. All antifreeze ranges from water/clear to light beer color until the dye is added. We supply exactly the same formula in 4 different colors to one very, very major antifreeze manufacturer that everybody knows.... only difference is the dye.
Now for some inside information.......
Evans "waterless" coolant contains water. It about 1% by weight on the sample I've tested. The owner of Evans told me their specification is < 3% water & at a recent industry meeting, he pushed to raise that limit to <5% water & still be able to call it "waterless". The main idea with Evans is "without water, metals can't rust"....but it has water in it, so metal still rusts. The BIG negative is that ethylene glycol (90+% of Evans) doesn't conduct heat (cool your engine) nearly as well as water. It's just like running "coolant concentrate" by mistake instead of "50/50". I did that once in a Trans Am and that car ran really hot. If you go to water-only (e.g. distilled water + corrosion inhibitor & no ethylene glycol at all) the engine will run at least 20-degrees farenheit cooler (assuming the thermostat will allow that to happen).
On that note, Water Wetter is basically a bottle of corrosion inhibitor + some surfactant. The main "hype" about Water Wetter is that it that it lowers the surface tension of water so it can get into more intimate contact with your cooling system and transfer heat better. BOLONY! It's the fact that you took the ethylene glycol out of your cooling system that makes the difference. If you dump it on top of 50/50 antifreeze your engine will not run any cooler...I've tested this in the laboratory & on the street. I've also tested the surface tension and it's not that low (many other similar products & many standard antifreezes have lower surface tension that Water Wetter). Also, Water Wetter does VERY poorly at preventing corrosion on aluminum....good on steel & cast iron...but poor vs. aluminum. So, if you have aluminum heads, don't use it, but OK with cast iron heads. From my own testing, Purple Ice (Royal Purple) & Lucas Super Coolant actually do much better vs. aluminum protection.
