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Never, ever "flush" the oil in a transmission... Just saying!
BMW recommended fluid service intervals increased to ridiculous lenghts when they began including it in their maintenance programs. Don't buy into "lifetime" oil, etc.
And yes, synthetics do have extended life before breakdown, but there is nothing wrong with being smart and using shorter intervals, ie, 5k mile oil changes. This, along with the well worn subject of "which oil is best", are searchable here and by using Google. You'll find enough banter on the subject to be reading for years! Lol.
Good luck!
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