Hi
"New" dex is just like "old" dex..its just called "new."
For the reasons listed above, I would flush and use a silicated coolant. G-05 and its clones (Mopar "Long Life" and Ford "Gold" ) fit that description, or just go with a real traditional green coolant....that has silicates listed clearly on the bottle.
Remember: Color means nada. Ingredients is everything.