This coolant D2053 OAT is a orange colour whereas the Triumph HD4X OAT is coloured green. When topping up/replacing with the new coolant (orange colour) check the coolant in the system. You can not mix the HD4X OAT with the new D2053 OAT, the radiator system will need to be drained and flushed thoroughly before filling with Triumph D2053 OAT.
