I've got the original sales brochure for the UK W126 from 1988, it doesn't include 0-60 times, but I've got the top speed and power info:

300SE / L : 188bhp / 131mph

420SE / L : 231bhp / 138mph

500SE / L : 265bhp / 146mph

560SEL : 300bhp / 156mph

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Oliver