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Water has a significantly higher specific heat capacity compared to ethylene glycol (antifreeze). Pure water has a specific heat capacity of approximately 4.18 J/g°C, while pure ethylene glycol has a specific heat capacity of about 2.42 J/g°C. This means that water can absorb more heat energy than ethylene glycol for the same mass and temperature change.
So waterless Evans coolant may be fine for classic cars that are started up occasionally and moved around but I wouldn't use it in anything you are going run hard. I read through every page of their website and never once do they mention specific heat capacity.
I could not possibly agree more!!!!
I didn't read Evans website. I only spoke with the maintenence guys at the museum. They're very passionate about what they do and they have a very large budget.
Looks like it is still 5 years/150k. All brands that say Dexcool say that. However, there are others, like Peak Global, that claim they are compatible with any other coolant and go for 10/300k or 15/400k.
I´m guessing to stay away from those and stick with the clearly labeled Dexcool bottles? The Peak Global is trying to tempt me like the sirens! They even made it orange. LOL.
Update...upon reading further, Dexcool is Organic Acid Tecnhology. The Peak 15 year/400k mile orange coolant is said to be 100% compatible with OAT. But there is a little catch...They do say complete flush and fill first. So I take that to mean if there is anything left in the system, Dexcool branded coolant is the way to go.
I think what I would do is drain, fill with the 15k OAT coolant, drive a little bit, then drain and fill again. MIght not be a bad idea to do it that way, anyway, even if I were to stick with the Dexcool, although doing it ever 4-5 years would probably be just as easy.
Looks like it holds 12.5 quarts but you can only get about 8 quarts out of it when you drain it.
As someone who has worked in the automotive aftermarket I take a very dim view of nearly all their claims. In my experience they don't have a fraction of the engineering and do a fraction of the testing that OE's do. I looked at all those claims and decided to stay with GM DexCool.
Water has a significantly higher specific heat capacity compared to ethylene glycol (antifreeze). Pure water has a specific heat capacity of approximately 4.18 J/g°C, while pure ethylene glycol has a specific heat capacity of about 2.42 J/g°C. This means that water can absorb more heat energy than ethylene glycol for the same mass and temperature change.
So waterless Evans coolant may be fine for classic cars that are started up occasionally and moved around but I wouldn't use it in anything you are going run hard. I read through every page of their website and never once do they mention specific heat capacity.
They did. They mention that the old ethylene glycol and 50% water combination has a combustion temperature of 248 degrees. They also talk about the corrosive properties of that much water in modern cooling systems.
It is more expensive than just dumping in glycol. It requires a full flush and test. But the op said they were going to flush it anyway.
It has been in use for a long proven time. Dexcool is proven also, but it contain a lot of water and has a lower combustion point.
I could not possibly agree more!!!!
I didn't read Evans website. I only spoke with the maintenence guys at the museum. They're very passionate about what they do and they have a very large budget.
Of course. Why read the website when you have already made up your mind. Everybody does that. Sure.
Looks like it is still 5 years/150k. All brands that say Dexcool say that. However, there are others, like Peak Global, that claim they are compatible with any other coolant and go for 10/300k or 15/400k.
I´m guessing to stay away from those and stick with the clearly labeled Dexcool bottles? The Peak Global is trying to tempt me like the sirens! They even made it orange. LOL.
Update...upon reading further, Dexcool is Organic Acid Tecnhology. The Peak 15 year/400k mile orange coolant is said to be 100% compatible with OAT. But there is a little catch...They do say complete flush and fill first. So I take that to mean if there is anything left in the system, Dexcool branded coolant is the way to go.
I think what I would do is drain, fill with the 15k OAT coolant, drive a little bit, then drain and fill again. MIght not be a bad idea to do it that way, anyway, even if I were to stick with the Dexcool, although doing it ever 4-5 years would probably be just as easy.
Looks like it holds 12.5 quarts but you can only get about 8 quarts out of it when you drain it.
Dexcool is the only OAT type coolant out there that uses 2-EHA (2-ethylhexanoic acid), which has been the source of a lot of problems attacking gaskets and seals (it's a plasticizer), and the cause of class action lawsuits against GM. Instead of reformulating the coolant and admitting their mistake, GM reformulated all their gaskets and seals to withstand it.
There are plenty of OAT coolants out there that are a better choice, and don't contain 2-EHA.
Dexcool is the only OAT type coolant out there that uses 2-EHA (2-ethylhexanoic acid), which has been the source of a lot of problems attacking gaskets and seals (it's a plasticizer), and the cause of class action lawsuits against GM. Instead of reformulating the coolant and admitting their mistake, GM reformulated all their gaskets and seals to withstand it.
There are plenty of OAT coolants out there that are a better choice, and don't contain 2-EHA.
Dexcool is the only OAT type coolant out there that uses 2-EHA (2-ethylhexanoic acid), which has been the source of a lot of problems attacking gaskets and seals (it's a plasticizer), and the cause of class action lawsuits against GM. Instead of reformulating the coolant and admitting their mistake, GM reformulated all their gaskets and seals to withstand it.
There are plenty of OAT coolants out there that are a better choice, and don't contain 2-EHA.
What year did they start using the gaskets and seals that can handle it?
I'm assuming this is what one of the previous posters mentioned about not mixing coolant types? I just had the check coolant level message pop up this morning so will need to add. I haven't checked it yet, but I'm going off the strong assumption that what's in there is orange dexcool and that's what I'll be adding.
Last edited by NortheastZ06; May 5, 2025 at 04:30 PM.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.
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