Will it damage a car engine if you leave an engine flush in too long? - Quora

Answer (1 of 15): An engine flush is a chemical solution designed to clean the inside of a car engine. It is commonly used during routine maintenance to remove built-up sludge and debris that can accumulate over time. However, leaving the engine flush in for too long can potentially cause damage

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Will it damage a car engine if you leave an engine flush in too long? - Quora

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