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The shops with the flush machines can pretty much flush everything out. The machines basically connect to a tranny line and keeps feeding clean fluid in as it collects the old fluid. They don't even drop the pan for it.
I'm not familiar with BMWs so you saying the oil filter is part of the pan has me confused. Are you saying that the oil filter housing has to be replaced to drop the transmission pan? Even if it is part of the pan, can't you reuse it and just replace a gasket?
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'20 240ix convertible
 
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