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 75F. Cool Down increases coolant flow for better heat transfer, lubricates all vital components and is approved by most race sanctioning bodies. One 16oz. bottle treats cooling systems of 12-20 quarts. Treatments last for one year or 30,000 miles, whichever comes first.