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It needs to be changed. The gear oil, even a full synthetic like the factory fill, can shear down and fall out of grade, and the additive package degrades over time. Even those that felt they were not having any problems comment on how much nicer the gearbox shifts and how quiet the trans is after a drain and refill with the OEM lube.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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