Originally Posted by jserna
I saw that too concerning the distilled water. I use filtered water when I mixed the antifreeze. I am glad the job is done. Just out of curiosity, what does the GM stuff have in it that is "bad" for all other makes of autos
DexCool is slightly acidic and will eat seals/gaskets that weren't specifically designed for it. Even some GM products had issues with this when they first started using it (especially 1996-1999), it also can turn to sludge if there is air in the system (i.e. a leak) or if it is mixed with any other coolant.
Honestly I'm surprised GM is still using the stuff, Zerex G-05 is a far superior product and is what Ford/Chrysler currently use.