Holdens, having iron blocks and heads, aren't so susceptible to the corrosion problems of many Euro, British and Jap cars, but you make a good point, and one I'd like to expand on:
When you buy a coolant inhibitor or antifreeze, try to avoid Glycol mixes. Glycol itself is a corrosive, and the inhibitor will wear out before the Glycol...
Something I learned only recently...
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