Umm - the sunroof looks to be about the same gauge steel
as the rest of the roof. Throw in a couple of pounds of
brackets and cable, and a few more pounds for the motor
in the trunk (I'm assuming this is not a wagon, or other
model with a hand-crank) and you've got more of a weight
difference in a couple of gallons of diesel.
In a word - no. The only significant differences in the
weight of the W123 sedans are the engine/drivetrain options.
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