Hi Ean ,
All depending on how much crud comes out of the radiator when you drain it . If its the original orange colour your draining out and you are changing to a different brand [eg green ] , i would flush the radiator out so you don't mix the two. I have also Cat extended life coolant but i was advised not to use it . So i replaced the coolant with the original Tectaloy V- Plus Orange coolant .


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