It's normal for the plugs to discolor. Plugs look close to normal, a little on the rich side. Pictures don't always show true color but I would not be concerned.

Is the reason you are asking about leaking coolant because the engine is missing, you are losing coolant, or there is an indication of coolant in the oil?

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas