HD COOL ORA ULTRA is a high-performance coolant concentrate providing corrosion protection by interacting with the metal surfaces where needed (engine blocks, cylinder heads, liners, water pumps and radiators).HD COOL ORA ULTRA contains organic additives (OAT – Organic Acid Technology) for extended drain intervals.Also available as a 50:50 mix called HD COOL ORA. ADVANTAGES : Optimal protection of cooling systems against freezing and metallic parts against corrosion. Excellent thermal exchange thanks to the OAT coolant technology, improving engine cooling efficiency and prevents from boiling. Anti-corrosion properties remaining at high temperature and through ageing thanks to the organic technology. Extended drain intervals thanks to low corrosion inhibitors consumption. Long lasting anti-corrosion properties on all engine components. Eliminates the risk of scaling and deposits in the cooling system. Avoids cavitation and increases water pump lifetime. Seals, hoses, pipes and plastic parts friendly. Nitrite free, amine free, phosphate free, borate free and silicate free.