Just finished doing my 240D motor mounts today. Jacking up with only one side unbolted worked fine. I couldn't do the left side without disconnecting the engine shock.

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Len
'59 220S Cabriolet
'83 240D 348,500 miles original owner
'88 560SL 41,000 miles - being parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 169,500 miles
'03 SLK320 26,500 miles