Originally Posted by Bmwe5320023.0

Great DIY, somehow I managed to screw this up lol!
I swear I read somewhere that you needed an Allen key to unscrew the filler cap. Well I guess I read the wrong diy and tried filling through the wrong hole.
I couldn't get any fluid in it and it would pour out as soon as I was pumping it in. I thought maybe I need to warm my transmission so it picks up the oil from the pan, which was empty anyway...
Started the car and it splashed transmission fluid everywhere under the car.
Finally I found the right 17mm filler plug and all is good now!
I wonder what was that other hole through which I tried pumping transmission fluid??