I think I'll just do an oil change on the rear diff, just because I don't know when it was last done. The oil I did see on my finger was clear, I just don't know what it looks like at the bottom of the housing (I checked the oil after the car had been sitting all night). Judging by the size of the housing, I don't imagine it will take much more than 1 quart of gear oil.
Should I get the rear diff to operating temp before draining, to float out any debris?
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.