Hi Quickboat,
I would change it (google Ranger protocol) when I saw it changing color, or at the very least when you saw particles in it. Don't wait until is black for goodness sake!
I think the dealer will laugh in your face if you ask him to change it because it's changing color, and then, later, he'll laugh behind your back when Nissan or you pay him 1200.00 to redo your clutch hydraulics (maybe....) under warranty.
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