Mercedes-Benz M03 engine
The Mercedes-Benz M03 engine is a naturally-aspirated, 3.0-liter, straight-6, internal combustion piston engine, designed, developed and produced by Mercedes-Benz; between 1926 and 1927. M03 engine
The side-valve six-cylinder 2,968 cc engine delivered a maximum output of  at 3,500 rpm which translated into a top speed of 100 km/h (62 mph). Power was transmitted via a four-speed manual transmission to the rear wheels which were fixed to a rigid axle suspended from semi-elliptic leaf springs. The braking applied to all four wheels, mechanically controlled using rod linkages. Applications
Mercedes-Benz 12/55 hp Type 300 Sedan

References

Mercedes-Benz engines
Straight-six engines
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Gasoline engines by model