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Old 08-23-2016, 04:57 PM   #1
Aggitated Monkey
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Default Antifreeze?

Running aluminum heads, pump and radiator. I have always been uncertain if I should cool with conventional (green) antifreeze or dex-cool. Would like to hear your thoughts.

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Old 08-23-2016, 05:02 PM   #2
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Running aluminum heads, pump and radiator. I have always been uncertain if I should cool with conventional (green) antifreeze or dex-cool. Would like to hear your thoughts.
I've got the same, and I use Evans. Very happy with it.
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Old 08-23-2016, 06:24 PM   #3
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I can't confirm this from my own knowledge, but a auto parts guy once told me that Dex-Cool is good but it needs to changed regularly and that it becomes corrosive if it's not changed. Like I said, not sure if this is true, but maybe others can confirm/deny.

I personally use Zerex G0-5.

- Mike
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Old 08-23-2016, 06:41 PM   #4
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I also use Zerox G05. It's what Dewitts recommended to use in my 65 and 00 (both have Dewitt's Radiators).

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Old 08-23-2016, 07:39 PM   #5
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I've been running the universal 5-year coolant (Prestone) since it came out... late 90's???

I have aluminum heads, intake, water pump and radiator. Never any problems and the radiator looks like new inside (it's almost 20 years old). I change it every 5 years.
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Old 08-23-2016, 10:11 PM   #6
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Thank you all for the input. I also have a Dewitts radiator. I think I'm going to drain and flush with clear water and go with the Zerek. Everything is 3k miles new and I don't want a corrosion issue.
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Old 08-23-2016, 11:29 PM   #7
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I used Prestone & change it about every three to four years, I drive about 2 thousand miles in the four cars I own a year. They seem to be doing fine. My wife has a Lexus & they want ot change it every year when it goes in for service. Good Luck Gene
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Old 08-23-2016, 11:31 PM   #8
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Zerex ftw
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Old 08-24-2016, 12:01 AM   #9
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Quote:
Originally Posted by zwede View Post
I've been running the universal 5-year coolant (Prestone) since it came out... late 90's???

I have aluminum heads, intake, water pump and radiator. Never any problems and the radiator looks like new inside (it's almost 20 years old). I change it every 5 years.
Same here.
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Old 08-24-2016, 10:27 AM   #10
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One thing to keep in mind about antifreeze, all types, is that the more you put in, the less efficient your cooling system becomes. Plain water would cool best, but that has obvious disadvantages. I use 25% concentration of antifreeze in my car. No cooling system problems .Depending on where your car is parked during the winter, you might consider this. Save a few bucks too.
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Old 08-24-2016, 11:47 AM   #11
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Quote:
Originally Posted by Aggitated Monkey View Post
Thank you all for the input. I also have a Dewitts radiator. I think I'm going to drain and flush with clear water and go with the Zerek. Everything is 3k miles new and I don't want a corrosion issue.
My DeWitts radiator came with an instruction sheet on the types of coolant to use. They specify the following...

Prestone Extended Life, Zerox G-05, Peak (green).

Always add distilled water ONLY to the cooling system
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Old 08-24-2016, 11:50 AM   #12
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Old 08-24-2016, 07:22 PM   #13
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Dex-Cool is designed for use with aluminum engine blocks. You don't need it. Use regular glycol antifreeze at a 50/50 mix with distilled water.
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Old 08-24-2016, 08:46 PM   #14
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Quote:
Originally Posted by Aggitated Monkey View Post
Thank you all for the input. I also have a Dewitts radiator. I think I'm going to drain and flush with clear water and go with the Zerek. Everything is 3k miles new and I don't want a corrosion issue.
If you don't want a corrosion issue, then Evans is the answer. It is waterless, hence no corrosion...http://www.google.com/url?sa=t&rct=j...m4LRzJ-XBK9gTA
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Old 08-24-2016, 09:04 PM   #15
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Quote:
Originally Posted by BKbroiler View Post
One thing to keep in mind about antifreeze, all types, is that the more you put in, the less efficient your cooling system becomes. Plain water would cool best, but that has obvious disadvantages. I use 25% concentration of antifreeze in my car. No cooling system problems .Depending on where your car is parked during the winter, you might consider this. Save a few bucks too.
Water has an annoying tendency to turn into steam which transfers heat very poorly. I was running my 69 on a very hot day, got off the freeway and got stuck in traffic. The antifreeze water mix boiled in the heads and blistered the paint on the hood!

I also do not have any cooling problems, and I've got a 690 hp big block in my corvette with a 2 row radiator.

Last edited by lurch59; 08-24-2016 at 09:07 PM. Reason: misspelling
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Old 08-24-2016, 09:56 PM   #16
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Engine compartment heat may be way too much for hood paint on a very hot day, IF you have uncoated headers and poor airflow through the engine compartment.

If the coolant is "boiling in the heads", then the pressure inside the cooling system had increased to the point that the pressure cap would be relieving itself. If it did not, there was no internal boiling.

My take is that your engine compartment just got to higher than 300*F (but not the coolant).

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Old 08-24-2016, 10:00 PM   #17
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My understanding is, that if you have a copper/brass radiator, use the green. Otherwise, use the universal modern stuff.
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Old 08-24-2016, 10:36 PM   #18
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Quote:
Originally Posted by 7T1vette View Post
Dex-Cool is designed for use with aluminum engine blocks. You don't need it. Use regular glycol antifreeze at a 50/50 mix with distilled water.
We've been through this before. There is nothing sacred about a 50/50 mixture.
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Old 08-25-2016, 12:36 AM   #19
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Thanks agin every one. I don't have a cooling problem and was running Presstone 50/50. I'll look at the Dewitts instructions and go with that. I was just concern with corrosion as every thing is new and want to avoid any problems with all the aluminum in my system.
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Old 08-25-2016, 10:16 AM   #20
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Quote:
Originally Posted by Aggitated Monkey View Post
Thanks agin every one. I don't have a cooling problem and was running Presstone 50/50. I'll look at the Dewitts instructions and go with that. I was just concern with corrosion as every thing is new and want to avoid any problems with all the aluminum in my system.
Have you considered a sacrificial anode? Corrosion will supposedly attack that instead of the rest of the metal in contact with the coolant.
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