I have a 1977 L82 with the original engine. While away on vacation my son noticed antifreeze leaking and not knowing any better added dex-cool to top off the system. Now I am being told that dex-cool will react with green antifreeze causing sludge and possibly attacking the copper. My question, what is the best way to completely flush the system and how much antifreeze will it take to refill the system. I will appreciate any help.
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