I flushed out around 4.5qts. Took out 5qts total after doing the transfer case.

I am well aware I didn't get all the fluid. I'll have to look at Alldata once I get back to work, but I recall the GM trans takes ~9qts as a empty fill. I didn't change the filter or drop the pan, so I know some was still left there. I was thinking if it is still smooth after a few thousand miles, I'd do the trans fluid every other oil change until I got all of the old stuff out, very similar to what you did. I just don't feel like putting much money or time into this X5 anymore, I'd rather spend it with family and friends during the holidays.

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