Yes, for sure. Get it changed. The gearbox oil in my 1994 S2 looked horrible!
The diff oil in my Ur looked even worse! I've yet to change the Ur gearbox oil but it's on the jobs list.
You can get new fill/drain plugs on ebay and I recommend you change them while you are at it. You might find they are seized (mine were on the S2). I got around that by welding a bolt in the opening and the heat got it moving.
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