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Hi Lon, my name is Jason.
Your friends are correct, and running any kind of acid through the cooling system is not something we would ever do. There is no way to know if your engine is damaged, but there is a potential for the acid to eat the seals in the seawater pump, eat the seawater pump impeller, and eat any and/or all of the coolers on the engine (heat exchanger, oil cooler, power steering cooler ect). That being said, there is no way to know if your engine is going to be damaged. However, if you find that you need a new impeller or pump, or if one of the coolers fails sometime quickly in the future, the failure can likely be blamed on the acid.
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