2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 76Get this manual
COOLING SYSTEM, CONTRECOMMENDED COOLANT Use only high quality antifreezecoolant mixed with distilled water in 5050 or 6040 ratio, depending on freeze protection required in your areaCAUTION: Using tap water in the cooling system will lead to buildup of deposits which may restrict coolant flow and reduce heat dissipation, resulting in possible engine damagePolaris Premium 6040 AntifreezeCoolant is recommended for use in all cooling systems, and comes pre-mixed and ready to use