When i re-booted the axles on my 280CE about 4 years ago i used high viscosity gear lube. I think oil is much better suited for the job than grease in this case, just my opinion though.

I just held the axle on vertical, filled the whole can with oil, pulled the boot down and fastened both clamps.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg