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Well I used B plug to fill mine up. I drained out a little over 4 quarts using a container with fluid measurements on it. I poured out 2 quarts of old fluid and replaced with 2 new quarts and pumped it all back in while the X was running in park. With all the fluid back in that came out, it dribbled out of the B hole. After a test drive and back on the rack again, i pulled out B plug and got a few drops out. So If I took out 4 quarts and put back in 4 quarts I don't think its over filled. Like I said my transmission will probably fall out now.
NOTE: This is how I did mine. You should do yours however you want. That Large C plug is hooked to a large plastic piece inside the pan. That should be a lot of fun filling that back up. My hypothesis is BMW does not want anyone to change the fluid, so they made it more complicated. BTW the trans has a sticker on it that says lifetime fluid, do not change or something like that and then a part # for fluid to use.
So Terry, I apologize for giving bad advise. Clearly I'm ignorant. Still good luck with your project.
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