40 / 60
Thread Starter
Melting Slicks
Joined: Feb 2018
Posts: 2,177
Likes: 1,044
From: North Texas
40 / 60
I often wonder why GM used a 40% Dexcool and a 60% water solution and not the standard 50 / 50 % mix that is standard with all the other cars being built.
Anyone have any insight into this?
Anyone have any insight into this?
Drifting
Joined: Oct 2007
Posts: 1,414
Likes: 484
From: NY
I'm curious to know why GM uses this product when it's only good for 5 years - mileage dependent.
The coolant in Japanese vehicles, like our Mazda and Lexus, is good for 10 years - also mileage dependent.
The coolant in Japanese vehicles, like our Mazda and Lexus, is good for 10 years - also mileage dependent.
Advanced
Joined: Nov 2018
Posts: 67
Likes: 29
From: Naples FL, & Lombard IL
As a mechanic I understood that the correct water/antifreeze mix is essential for proper cooling. People had a theory to use straight antifreeze this way there wouldn't be corrosion, Problem with that back yard mechanic theory is the quenching would not be effective and it generates other problems. Stick to the correct recipe, maybe slightly higher water mix is needed to keep corvette engines cool.
Instructor
Joined: Mar 2022
Posts: 174
Likes: 93
From: Poland
2022 C7 of the Year Finalist - Unmodified
40/60 to better cool engine at cost of freezing point
more info here
https://www.corvetteforum.com/forums...-60-ratio.html
more info here
https://www.corvetteforum.com/forums...-60-ratio.html
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Thread Starter
Melting Slicks
Joined: Feb 2018
Posts: 2,177
Likes: 1,044
From: North Texas
40/60 to better cool engine at cost of freezing point
more info here
https://www.corvetteforum.com/forums...-60-ratio.html
more info here
https://www.corvetteforum.com/forums...-60-ratio.html
Thanks all.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
I also know that it is highly likely that Dex can last longer because after 5 years the drained fluid still looks like it did when I put it in the system.
As for the 40/60 mix that is because water transfers heat better than antifreeze and the C7 cooling system will perform better with a higher percentage of water.
Bill
Instructor
Joined: Mar 2022
Posts: 174
Likes: 93
From: Poland
2022 C7 of the Year Finalist - Unmodified
Some basic info below
https://www.autoblog.com/2009/12/28/coolant-color/
Instructor
Joined: Mar 2022
Posts: 174
Likes: 93
From: Poland
2022 C7 of the Year Finalist - Unmodified
and a litlle bit ground breaking info to complete previous link
https://ricksfreeautorepairadvice.com/is-dexcool-bad/
https://ricksfreeautorepairadvice.com/is-dexcool-bad/
Safety Car
Joined: May 2015
Posts: 3,680
Likes: 1,040
Thanx ventor... Guess I best find someone to do the change chore.. or this 20 year old Chevy will destruct with only 50 thousand miles driven... Just doesn't sound right...then again it's Chevy... Never had this problem with the 911.
Instructor
Joined: Mar 2022
Posts: 174
Likes: 93
From: Poland
2022 C7 of the Year Finalist - Unmodified
There are strange times nowadays - let everybody decide on their own whenever best before date on salt is right or wrong - that's the system we live now. Hope I get what I mean.
5th Gear
Joined: Mar 2022
Posts: 5
Likes: 4
All coolant has a fixed usable life. additives in the coolant breakdown with time and thermal cycles. These additives do everything from inhibit corrosion anf microbe growth, balance the ph level of the system, to bind the coolant mixture to itself. If the coolant additives break down alot of bad things can happen to you engine. If 5 year 100k a little early possibly but isn't the the point of preventive maintenance