I had the opportunity to smell the fluid when I checked the rear abs sensor on my 87 300e (appx 125,000 miles). It also had a nasty odor. It may have been original. Is there a recommended or customary mileage or time for changing it? Since mine smells I guess it also should be changed.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)