I always torque the lug bolts on my W124 to 80 ft. lbs. and so far this works for me. I know there is a way to determine recommended torque based on diameter of the bolts, but I haven't figured that out yet. Maybe someone else out there can chime in???

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280