I just had my tranny flushed at 65K. The dealership did it and with over 600 miles on her now after the flush no problems. I've always thought around 55-65K is a good time to flush the tranny and radiator.
Lots of problems reported on this forum by those who flushed the trans. Drain and fill is the way to go according to Nissan. The dealers push the trans flush to get $ from you that you need not and shouldn't spend.
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