M15
Inline-6- 15 1.7 L · 1,692 cc
33 PS
24 kW · 32 hp at 3,200 rpm
Mercedes-Benz Medium Sedan · Typ 170
Hans Nibel’s Typ 170 — swing axles and a new middle-class Mercedes.

The Typ 170's technical layout was the real story: semi-elliptic springs up front and swing axles at the rear gave the car a modern ride and handling balance unusual in its price class. Nibel's design established engineering principles that would echo through Mercedes-Benz's smaller models for years, making the Typ 170 one of the most important middle-class chassis of the pre-war era.
Built from 1931 to 1936, the Typ 170 reached 13,901 examples — a strong production total that underlines its commercial success. It directly preceded the Typ 170 V and laid the chassis groundwork for the volume Mercedes-Benz sedans that would carry the company through the 1930s.

2 distinct series across 1931–1936 — each identified by its chassis and engine numbers from period factory data.
| Model | Model years | Chassis | Engine | Transmission | Total |
|---|---|---|---|---|---|
| Type 170 Sedan | 1931–1936 | 15 | 15 | 13,775 | |
| L300 Van | 1932–1935 | 15 | 15 | 126 |
* The published production figure covers every series of that model; the source does not break it down further.


The M15 as fitted to the W15.
33 PS
24 kW · 32 hp at 3,200 rpm