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How do supplemental coolant additives protect liners and blocks from pitting damage?

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How do supplemental coolant additives protect liners and blocks from pitting damage?

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Pitting damage is also known as cavitation erosion. It is caused by air bubbles forming in the antifreeze. When the air bubbles contact a very hot surface such as a cylinder liner or a coolant passage in the exhaust area of a cylinder head, the bubbles burst and cause erosion of the metal. Good quality antifreeze has additives in it to prevent the formation of air bubbles and prevent cavitation erosion. Therefore, an additional coolant additive is not necessary. The antifreeze mixture should be changed at least every 5 years.

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