It must be so that it forces you to remove the cover .
In cars and trucks there is a black break -in grit that is produced after 5k miles, from the action between the pinion and ring gear , it coats the metal the heavier the vehicle the more is produced .
you have to spray it out with carb/ brake kleener to remove it or the bearings wear ealier than normal, just changing fluid does not do much. may not be needed on GT's though
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