Year Round Coolant is a specially-formulated, pre-diluted, full-fill, low-silicate coolant for aluminum motorcycle / snowmobile / ATV engines and radiators. For use in all machines with a water-cooling system, Year Round is designed to prevent vapor-lock and corrosion, and can actually enhance your cooling system's efficiency. Do not add water, as this is a ready-to-add, pre-diluted coolant. Non-corrosive, specially formulated for aluminum engines, Year Round is phosphate-free and non-abrasive.