I would like to replace the coolant in my 1984 Pontiac Firebird. It currently has the green ethylene glycol coolant. I have 2 gallons of new (never opened) antifreeze. one is Zerex Green 50/50 and the other is Prestone 50/50 mix but says "for any car and any color antifreeze". It appears to be a light yellow color. Is there any issues if I use these 2 gallons when I swap the antifreeze or do you feel it is better I have (2) gallons of the Green Xerex coolant, as what is in there now? I would like to use what I have and not buy anything else but also don't want to cause problems with any engine internals.
Any advice would be appreciated. Thank You.
The best approach would be to lookup the type of chemistry used in each antifreeze on the manufacturers' web sites. If they're the same they are safe to mix together. (The color is just a dye and while it more or less corresponds to antifreeze type you can't count on that.)
not enough information.
"green" antifreeze is usually ethylene glycol with silicates, but not always
I have no idea what type your Prestone is just from the name and color.
If you mix incompatible antifreeze types, you'll have sludge in your system.
you could try taking your two jugs and mixing the together in a big container and see what they do.