The W123 is actually not nose heavy at all. I put mine of 4-wheel race scales a few weeks ago. With a full tank of fuel the car weighed 3400 lbs on the nose with a 53/47% front/rear weight distribution.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine