I have three books for the 124

The FSM (actually a set): very good and informative, ... once you figure out the indexing system / arrangement system

Bently E-Class Owner's Bible: Many errors, pretty much a book to read for a primer, or entertainment, not for technical accuracy nor repair work (IMO).

Haynes Mercedes-Benz 124 Series: Very useful workbench manual, might not have the technical details to rebuild an engine or transmission, but for most tasks easier to navigate than the FSM and accurate.

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Gone to the dark side

- Jeff