Coolant Recommendation
Team Owner
Joined: Sep 2001
Posts: 62,139
Likes: 1,728
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
I use Prestone 50/50 unless I feel like tweaking the ratio.
If you only drive in summer you don't need it 50/50, for example.
If you only drive in summer you don't need it 50/50, for example.
Le Mans Master
Joined: Aug 2017
Posts: 6,939
Likes: 1,488
From: New Jersey
I run prestone green, at a 60/40 ratio. (Little more water helps with cooling, better thermal conductivity) measured by volume. Its close enough. My garage only goes into the 20s on even the coldest days so it isn't a concern. Change it out every few years.
Safety Car
Joined: May 2001
Posts: 4,747
Likes: 1,642
From: Fairfax Virginia
A second on "Prestone". I use it in a mixture of 70% water 30% anti-freeze as where I live it doesn't get that cold and we deal more with a warmer humid climate. The more water the better the heat transfer, anti-freeze does not transfer heat as well as water. The second thing is to replace the radiator cap every few years as they loose their pressure rating over time. A weak radiator cap will allow an engine to overheat as it can no longer hold the pressure.
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