My clutch fluid looks like that at every oil change just about. I remove the old fluid from the MC and do quick gravity bleed on the system every 5-10k miles. I am running Dot4 also. In the summer I have to do it more often due to the heat of the cats. Nissan didn't rap the little metal line down at the bottom. It has some kind of rubber protector on it but it does not cover it all and does nothing for the heat.
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