Kevin Kemper wrote and weighed the difference. It is surprisingly a lot less than it feels. I will bring my bathroom scale to the warehouse so you can get more accurate numbers on these part weights.
Aluminum: 22lbs
Steel: 50lbs
28lbs difference.
So we are both right. :-)

http://www.benzworld.org/forums/r-c107-sl-slc-class/1710073-280slc-snowball-rally.html#post5765798

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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,