Originally Posted by lght1
Dexcool must never be installed into a car that was not factory filled with it. Key cooling system components will be harmed. The solder joints in the rad and heater core..just to name a few...
In the Tech Info section of this site, under Common Problems, there is a heading for Dexcool "Frequently Asked Questions:
Can DEXCOOL organic acid antifreeze be mixed with ethylene glycol
It is ethylene glycol based antifreeze! The concern with mixing comes from
the fact that there are very different chemical inhibitor packages in use.
Most leading technologies will work very well when used as intended,
typically at 50% in good quality water. If the coolants become mixed with
DEXCOOL, however, one study showed a possible aluminum corrosion problem in
How long will it last?
Uncontaminated, the engine manufacturers instruct that it may be kept in
service for 5 years or 150,000 miles in cars.
Does it protect aluminum?
Yes, even though it contains no silicate, the primary aluminum protector in
conventional antifreezes, published data shows that it protects aluminum.
What are the advantages of DEXCOOL compared to the previous GM 6043
Compared to old-fashioned phosphate antifreeze, it may be more stable and
improve water pump life.
This is, in part, what the article contained. You may want to view the entire article in the Tech Info section. My '91 Olds originally came with the "green stuff" and I flushed and filled it with Dexcool about 3 years ago with no problems witht the cooling system at all.