just changed rear diff oil to Amsoil on my 22 PW at 800 miles. When I removed fill plug oil was weeping out so manufacture must went +1/4" from the fill line, I filled till it started to weep then let it completly stop weeping before I replaced fill plug. It took around 3.8 qrts to get to the fill hole.
The used oil had a very silvery metallic color, the fill plug has a magnet that was covered in a thick silver metallic paste. The locker magnet had a small amount of same paste, Only saw a few flecks of metal flakes, nothing big.
Only thing I would say, is now I wonder if the wearing in is complete at 800 miles. Probably could of waited till at least 1500 miles before I changed it. Either way I was very suprised how contaminated the oil was.
Rear locker, immediately falls in now after the switch to Amsoil.
Torqued to 25lbs with original gasket, no leaks.