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It depends.
If your car uses the special long-life coolant dex-cool (orange) no immediate damage with normal 50 water 50 antifreeze. However, according to GM for my Oldsmobile Intrigue doing this would reduce the suggested coolant maintenance point from 150,000 miles down to 30,000 miles.
If your car uses normal (green) anti-freeze and you were to use dex-cool it could permanently damage the vehicle since the particles not designed for the vehicle will always remain.
So what did the manufacturer suggest as optimal and what did you put? And what do you consider as damage? Introducing a hassle or complete breakage?
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