A6 rear differential fluid change

[MXHOWES at aol.com]

If you have an 1/2" impact wrench don't be afraid to use it (on the  lowest 
setting). Use something like PB Blaster then just sit on it for 10+  
minutes with the impact wrench on LOW and occasionally reverse  directions. This 
is a trick used by diesel mechanics on heavy equipment.  I've seen a special 
jig fabricated to hold the wrench while you go have a  cup.
Jim
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