I disagree on the percentages but regardless if it is 60 or 90 it is better than leaving all that gunk in there and not changing the filter.
*Edit*

I said I want to replace the 6 that will come out by removing the pan. Not 5. Therefore there is whatever is in the torque converter and you can get some out with a pump.

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BMWCCA # 480346

'72 e6Tii rip
'90 e30iC sold