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  • Cool Down improves the performance of your coolant and is safe for all radiator systems. Ideal for racing, street, RV and tow vehicle applications. It reduces cylinder head temperatures up to 50° F! Cool Down increases coolant flow for better heat transfer, lubricates all vital components and is approved by most race sanctioning bodies. One 16 oz. bottle treats cooling systems of 12-20 quarts. For straight water applications, an additional 50% more Cool Down is recommended, while diesel applications requi
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