Triumph Performance Lubricants - Coolant

Triumph D2053 OAT is coloured orange compared to the Triumph HD4X OAT which is coloured green. The two coolants MUST NOT BE MIXED TOGETHER as this could result in reduced cooling performance and a reduction in corrosion resistance. When replacing old HD4X OAT coolant, it is important to fully drain and then flush the cooling system with distilled water before refilling with D2053 OAT coolant.