Hi guys. My rear diff is leaking where the driveshaft enters. I can't get the bloody top plug undone to top it up until I get chance to change seal. Any ideas on how to get it undone?
I've already tried a long bar and socket and wd40.

 

I just changed my oil and it was pretty stuck on as well, just clean it up as much as you can and plenty wd40 to soak in

Tried some heat on the surrounding part of the nut?

 

Sorted. I used extension bars to get from diff to beyond bumper, placed the last one over an axle stand and gave it a good turn with a long handle and a piece of tube.
http://s1336.photobucket.com/user/da...f2950.jpg.html