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[ians]

If its black I would be changing it (preferably before then).   Likewise if you start to notice it,  get it changed.
Whilst the oil itelf may last longer it will still be picking up crap due to engine wear and combustion byproducts, along with moisure.  Changing oil cleans the engine of these toxins.  (I've had the same discussion with colleages who think the 20k miles is fine between changes)