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5 years is too short a time to have damage like that.....
First to have problems like your describing in a 5 year time span had to be either a poor quality (used) engine to begin with or you didn't use any type of coolant that gave corrosion protection.
I deal with vehicles on a regular basis that used Dex and mine originally came with it. I wouldn't be caught dead using it. If you can't afford propylene glycol, then use the typical ethylene glycol.
Did you know that several GM vehicles had Dex powder in the cooling system when delivered to the dealers. As these same vehicles aged, they produced a sludge that looked like play sand? Funny how I routinely see issues with Dex that I never see with good ole green.
Don't make the mistake of cutting 100% with tap water. Only cut it with distilled water or buy 50/50. Minerals in tap water cause "bloom".
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