I track the shit out of my car, have yet to change the DKG fluid and only changed my diff oil cuz I opened it up to weld it. The trans oil really doesn't see the same stress as your engine oil (which still really only needs to be changed ever 5K even with heavy track use, modern synthetics are good shit) because there's not much to contaminate it. Your engine oil, if you chose a good one, would last 100k+ miles if it wasn't for all the blowby and crap getting in it.
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