I believe that the recommended fluid, STC50519, Cold Climate Fluid is a green colour when it's new and clean.
 
Mine is black as well, I was thinking the same " didn't seem right" so I'm glad to hear that it's nothing to sweat about!
 
not easy to change it completely but you can empty reservoir and refill it , if you do it several times the more you change,if you do it once a year or so it keeps systems oil fresh
 
not easy to change it completely but you can empty reservoir and refill it , if you do it several times the more you change,if you do it once a year or so it keeps systems oil fresh
Also I've seen these additives that supposedly seal leaks in the system, I've a very slight leak coming from the steering box, so I may be an opportunity to use that when I refill
 

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