M28
Inline-4- 28 II 1.7 L · 1,697 cc
38 PS
28 kW · 38 hp a 3,400 rpm
102 N·m
75 lb·ft a 1,800 rpm
Mercedes-Benz Medium Sedan · Typ 170 H
Rear-engined 170 H — the last of the Heckmotor street cars.

Mercedes-Benz developed the W28 as the refined successor to the rear-engined 130 idea: a 1.7-liter side-valve engine driving the rear wheels through a four-speed gearbox, with independent front suspension and a body that read as a normal family car rather than an engineering experiment. The layout freed cabin space and kept mechanical noise aft of the occupants, even as the industry was moving back toward front-engine orthodoxy.
Production ran from 1936 to 1939, and the published archive tables record 1,507 examples on the W28 chassis — a modest but meaningful run that closed the chapter on rear-engined Mercedes passenger cars until very different times.

1 distinct series across 1936–1939 — each identified by its chassis and engine numbers from period factory data.
| Modelo | Anos-modelo | Chassis | Motor | Transmissão | Total |
|---|---|---|---|---|---|
| Type 170 H | 1936–1939 | 28 | 28 II | 1,507 |
* O número de produção publicado cobre todas as séries desse modelo; a fonte não o detalha além disso.


The M28 as fitted to the W28.
38 PS
28 kW · 38 hp a 3,400 rpm
102 N·m
75 lb·ft a 1,800 rpm