You're at that "iffy" point where the clutch packs are worn and this worn material is floating around in your ATF which is why your ATF continues to work fine. Adding new fluid now will remove that material. BMW has been known to offer 'good will' replacements on transmissions which fail before 100k miles, so you could risk it. Besides, if you're going to get rid of the car ~100k miles you might not waste the $$$ on a fluid change.
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