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Green coolant was probably used to top off the blue coolant, or after a repair, very common for an all purpose shop to add green universal coolant. Since there are 4 balls floating, you have freeze protection. Who knows when the pump may go, I've seen many N55 with 100k+ miles on the original pump. If it were mine, I'd flush it now since you don't know what they put in it and fill with BMW coolant, it's not expensive.
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