4 Seasons Long Life Premix Summer Coolant and Anti-freeze is a premix with an active 50% aqueous solution. 4 Seasons Premix is free of Nitrates, Nitrites, Phosphates, Amines and Borates and contains inhibiting salts in a super stabilized silicate solution. The requirements of ASTM D 3306 or ASTM D 4985, are fully met by the Coolant heat transfer liquid. Benefits of Engine Coolant based on the additive, meet the International, National and Military Standards. OEM Specifications met by 4 Seasons Anti-freeze and Summer Coolant are: Porsche, VW, Audi, Seat, Skoda, Mercedes, Ford, Man, Chrysler, BMW, Volvo. Dosage: For normal operated vehicles: petrol & diesel, 25 30% of the 4 Seasons Concentrate is recommended or 50% 4 Seasons Premix at 100 % solution. For truck, tractor, farm machinery add 40% purified water. For all high performance motorcycles (water cooled) 50% to 60% 4 Seasons HPSC concentrate is recommended or 50% premix at 100% solution.