First unitary Mercedes. Overhead-cam petrol engine from 1957 and enlarged diesel unit with ohc from 1961. Sidevalve 180 pretty gutless, but most you'll find will have upstairs cam. Improved low-pivot swing-axles from 1956.
- 1767cc/1897cc (S4 SV/OC) petrol; 1767cc/1988cc (S4 OHV/OC) diesel
- Front engine, rear-wheel drive
- Production dates:
- 1953 to 1962
- Number produced: