Hi, can anyone tell me what kind of coolant would be best for xj6 4.2? I know it should be meet BS 6580 and be blue. Coolant in my daimler is green and is there for last 4 years,at least.I would prefer aaa classic coolant,but they dont ship to ireland. Here in Ireland only in Halfords they have their own Halfords coolant concentrate meets BS 6580,but is it any good? And I would like to flush cooling system,here is only Holts Speedflush or Holts Radflush 2-step.Does anyone has any experience with them? I just read somewhere they might be too strong for this old type of engines and could damaged it ,is that true??