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Keyser 40 Below is a concentrated heavy duty cooling system stabilizer designed to be added to your radiator. *This coolant additive will reduce engine water temperatures up to 40 degreesContains less than 10% ethylene glycol!* Applications / Uses: Rv Coolant Sytems Motorcycle Coolant Sytems Automobile Radiators, Truck / Car, Diesel And Gasoline Engines Sport Utility Vehicles / Atv Industrial Equipment Auto Racing Advantages: Prevents vehicle coolant temperature from rising excessively while vehicle is towing, climbing, sitting in traffic, or running with restricted air flow Maintains coolant operating range of 180 - 210 Degrees Stabilizes cooling system Do Not: Use propylene glycol antifreeze Use with stop leak or radiator / block sealer