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I just did this change on my 2011 335 xdrive sedan. Man what a bitch. Bought a 14mm hex socket from harbor freight, pressed out the hex bit from the socket and used an open ended wrench to get the drain plugs off. YOU NEED A RATCHETING CROW/OPEN END/CLOSED END WRENCH. But really, its the only way you can do it. Oh I also bought the fluid transfer pump at harbor for $6. Worked like a charm. Case took about 75% of a quart. Btw not all open ends will fit in the tight space, try to find the thinnest one you can. And a high quality one with a lot of pawls so you can utilize the 2 clicks of throw you get with the wrench.
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