I did my first tyranny drain and fill at 87k miles with Valvoline Dex VI. I ran that for 30k miles then drain and filled again and I'm now at my 30k mark again.
The proper procedure is to do 2 drain and fills two weeks apart (assuming you're driving everyday). Then on the third drain, drop the pan, clean it and the valve body (portion of the exposed transmission) and replace the filter and gasket.
For the GM tranny any Dexron 6 will be fine.
2002 Sterling Gray Metallic M5
2006 Schwarz Black Metallic X5 3.0
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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean
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