Dex cool vs Anti freeze (green)

**a338566** · 02-18-2008, 06:11 AM

I just picked up my 2000 yukon, it has the 5.7 vortec in it. So as i do with all used vehicles i did all of the regular tune up stuff. when i got to checking the coolant it had green anti freeze instead of dexcool. I have heard horror stories about this, what do i do from here? The coolant overflow tank needed topped off so i did it with regular green anti freeze, figuring that is what is in it now so it cant do any more harm.

Thanks for the help.

Joe

**hoss 2000 z-28** · 02-18-2008, 09:58 AM

Dexcool (orange) from what I've been told can gum up and cause big problems if it's not flushed and replaced with universal pre-mixed. The previous owner saved you the trouble and switched over. I think your Yukon is in good shape.

When I bought my Z used at 50K the orange stuff was in it and there was a coating of it sticking to everything! I thought it had ruined the radiator, etc. but after the forced flush it cleaned up really well. Got lucky, I've heard some horror stories.

**Nitrous** · 02-19-2008, 05:54 PM

There's nothing wrong with the green anti-freeze or Dex Cool. I've ran both for years and actually had more problems with the green probably due to contaminated water. I've run 100% Dex-Cool in all my vehicles for the last 15 years with no issues at all. I think it's moreless a preference of the two.

Dex-Cool (ethylene glycol) is identical to the Chrysler & General Motors factory fill. Havoline had the original patent on Dex-Cool and manufactures it for GM. The benefits of Dex-Cool are:

Lower alkalinity
Contains NO silicates, resulting in longer lasting water pump and engine seals; longer shelf life.
It is Nitrite-, borate-, phosphate-, nitrate- and amine-free.
100% biodegradable in its pure unused condition.
Longer lasting (Dex-Cool has been shown to remain above 95% of its original concentration after 150,000 miles in automobiles)

Here's a good article to read if have a little time.

http://www.imcool.com/articles/antif...l-macs2001.php

**a338566** · 02-20-2008, 04:41 AM

Thanks a lot nitrous that article was exactly what i needed, that should be a sticky on this site. I have read a lot of different things but that seems to clear it up.

Thanks again