Originally Posted By: kschachn
My E34 requires a short wrench for the differential fill plug, I bought a socket-type Allen wrench and you could pop the wrench part out of the socket. It was about 1" long and then I put a 6-point wrench on it. No problems getting the plug in or out. Just a suggestion.
This is what I did with my E36 for a while. I ended up buying the low profile socket because I had picked up a rebuilt differential on which the plugs were so tight that my wrenches broke before the plugs came loose. Plus, I was just tired of jury rigging it every time and wanted the ability to torque the plugs to spec, just on principle. The rig definitely worked until then, though.