That fluid looks very dark and greenish and a lot of dirt on top part of reservoir. It's probably not been changed for ages. The green colour comes from additive which turns green from water so it looks like it has absorbed fair amount of water from air moisture and boiling temperature has been decreased. I would be looking to change fluid soon, it's supposed to be changed every 2 years regardless of mileage.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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