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I have seen a white residue on the inside of some coolant hoses. What is this and does ES Coolant cause the same effect?

April 26, 2017cause coolant es Hoses Residue seen white

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I have seen a white residue on the inside of some coolant hoses. What is this and does ES Coolant cause the same effect?

1 Answer

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Analysis of these whitish deposits reveals that they are composed of hose additives added to the rubber to enhance its performance. Zinc oxide is responsible for the bulk of the light deposit material. All engine coolants have this effect.