I have to do this to mine. I would NOT have paid what I did if I had caught this defect. Its is getting worse little by little. Going on a year now and still have it, but I am sure not for much longer. I *may* do a flush and rebuild the valve body as a quick test. I do not want to have to drop the trans

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car