Quote:
Originally Posted by Heartworm
Somewhere on this board I thought I saw mention to not using the Dex Cool GM type coolant with the green stuff. Maybe I dreamed it. The concern was that they did not mix together and you got pockets of one type that did not circulate as well. May be a myth, but I am good at perpetuating that.
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you don't want to mix dex cool because it's an extended service antifreeze. never mix extended with old school green antifreeze. all greens can mix, but as mentioned, you may affect some anti corrosion properties. not a problem if you flush your system every so often and replace with fresh coolant.
mixing extended service and green coolants can cause bad gelling. also, many extended service coolants won't mix with other extended service coolants, so be careful there. fleetguard makes an es coolant that does mix with others, so if you need to, look for it. it will be blue in color.