What coolant do you use?

[TransAm11973]

I know GM says to use DexCool but I wanted to see what you guys use and if you have had any issues. I noticed a bit of the ole brown sludge in my overflow resivoir, never had it before. Think its time for a flush, wonder if the cold has anything to do with it

[bigrondownhiller]

Even if it is dexcool I would flush it. It probably hasn't been done before. I would change the thermostat too.

[346ci]

I use dex cool and would recommend flushing it out if you haven't already, t-stat is a good idea too.......I learned the hard way

[Ryans99LS1]

I run regular coolant, no dex.. all it takes to switch is a complete drain of the system which means getting it out of the block before you put the regular stuff in. Car runs great.

[0rion]

if you decide to run regular glycol make sure you get all of the dexcool out of the system. If not it will sludge up and eventually harden. I run global in mine.

[rbob93]

Dexcool since new.
Flush & renew every spring.
145,000 miles strong.

[JoshieDoom]

DexCool.

155k

[DIRTY JERZY]

DEX just dont let the change interval go for 5 years like the bottle says

[SteveC]

I use a mixture of DexCool and distilled water and a bottle of RP "Purple Ice", I change the coolant every 15K (garage queen), and I never have had any issues.

SteveC

[Ed Blown Vert]

Distilled water and water wetter

[0verkill]

Distilled water and water wetter

i run the same in with the dex. dont mix the dex like sead befor or you will have big issues down the line.