Yes, I’ll say it. That coolant is the WRONG coolant for vehicles that were manufactured by a company that specifies Dex-Cool.
That green coolant is the RIGHT coolant for my Dodge Caravan, though. The manufacturer specifies it.
See that little Grand Prix photo in my post? I could put green coolant in it. I could put Autolite spark plugs in it. I could put 10w40 oil in it and probably have it run. I’ll bet I could run with Dex/Merc transmission fluid instead of the right DexronVI fluid, but how well and for how long? Experiment and who knows?
However, when I purchase used cars, as I did when I bought the Grand Prix, I check to see how the vehicle was maintained by checking records and fluids, etcetera. I have never hired a mechanic to do my checking.
If that Grand Prix had green coolant in it I would have walked. That would be a deal killer to me. I’d have to wonder why somebody would not maintain the vehicle according to the manufacturer, who did it, and what other surprises await me should I choose to purchase the car.
I own all the books for my cars. I have a ten pound set of GM services manuals for that specific Grand Prix. I have the Owner’s Manual, too. I go by the book(s).
Elvis? I made up the part about the Dex-Cool. I have no idea what type of coolant he uses or where he gets it.