what antifreeze is everybody using?
I'm running Shell pre-mixed low silicon green stuff.
As for Dexcool, I ran it in my previous engine and it slimed/sludged up in the overflow tank. A GM engineer who happened to be at one of the tracks I raced at explained it to me...it's designed for use in completely closed cooling systems. The newer cars have a pressurized overflow tank, so the coolant isn't exposed to ambient conditions. Running Dexcool in a conventional vented overflow tank will accelerate sludging breakdown.
As for Dexcool, I ran it in my previous engine and it slimed/sludged up in the overflow tank. A GM engineer who happened to be at one of the tracks I raced at explained it to me...it's designed for use in completely closed cooling systems. The newer cars have a pressurized overflow tank, so the coolant isn't exposed to ambient conditions. Running Dexcool in a conventional vented overflow tank will accelerate sludging breakdown.
I think that Dexcool is used because its supposed to have a longer life, since nobody every flushes their coolant systems in newer cars. It doesn't like being mixed with other things and that's when the sludging begins.
On The Tree
Joined: Oct 2002
Posts: 194
Likes: 0
From: Tampa, Florida
Originally Posted by crainholio
I'm running Shell pre-mixed low silicon green stuff.
As for Dexcool, I ran it in my previous engine and it slimed/sludged up in the overflow tank. A GM engineer who happened to be at one of the tracks I raced at explained it to me...it's designed for use in completely closed cooling systems. The newer cars have a pressurized overflow tank, so the coolant isn't exposed to ambient conditions. Running Dexcool in a conventional vented overflow tank will accelerate sludging breakdown.
As for Dexcool, I ran it in my previous engine and it slimed/sludged up in the overflow tank. A GM engineer who happened to be at one of the tracks I raced at explained it to me...it's designed for use in completely closed cooling systems. The newer cars have a pressurized overflow tank, so the coolant isn't exposed to ambient conditions. Running Dexcool in a conventional vented overflow tank will accelerate sludging breakdown.
Originally Posted by 68LSS1
What he said. If you have a leak and are using Dexcool, this will also "sludge" the antifreeze. If your using a open system (with overflow) I wouldn't use Dexcool. With a closed system you can easily run more pressure which translates to lower operating temps though.
The only bad side-effect of this was it blew my old-as-dirt heater core after one season. After replacing that, I went with a 16# non-vented cap and that's what I'm running with the LS1 now.
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Teching In
Joined: May 2004
Posts: 1
Likes: 0
Dexcool Chevy Design
Originally Posted by crainholio
I'm running Shell pre-mixed low silicon green stuff.
As for Dexcool, I ran it in my previous engine and it slimed/sludged up in the overflow tank. A GM engineer who happened to be at one of the tracks I raced at explained it to me...it's designed for use in completely closed cooling systems. The newer cars have a pressurized overflow tank, so the coolant isn't exposed to ambient conditions. Running Dexcool in a conventional vented overflow tank will accelerate sludging breakdown.
As for Dexcool, I ran it in my previous engine and it slimed/sludged up in the overflow tank. A GM engineer who happened to be at one of the tracks I raced at explained it to me...it's designed for use in completely closed cooling systems. The newer cars have a pressurized overflow tank, so the coolant isn't exposed to ambient conditions. Running Dexcool in a conventional vented overflow tank will accelerate sludging breakdown.
If this is the case, why does my 97 Chevy Suburban have a non-pressurized overflow tank? Faulty design that I have to live with, or what?
Originally Posted by Thunderbolt
If this is the case, why does my 97 Chevy Suburban have a non-pressurized overflow tank? Faulty design that I have to live with, or what?
