The Mercedes Benz M136 Engine^[1] was a 1.7 L (1,697 cc) otto-cycle (gasoline) inline-four engine introduced by Mercedes-Benz in 1935 for its new W136 sedan. It was initially used in the W136 170 V.

Mercedes-Benz M136
Overview
Manufacturer	Daimler-Benz
Production	1935–1955
Layout
Configuration	Inline 4
Displacement	1.7 L (1,697 cc) (1935-1950) 1.8 L (1,767 cc) (1950-1955)
Cylinder bore	73.5–75 mm (2.89–2.95 in)
Piston stroke	100 mm (3.94 in)
Cylinder block material	Cast iron
Cylinder head material	Aluminum
Valvetrain	Side valve
Compression ratio	6.5:1
Combustion
Fuel system	Solex carburetor
Fuel type	Gasoline
Cooling system	Water-cooled
Chronology
Successor	M121

It was enlarged to 1.8 L (1,767 cc) in 1950 and installed in the W191 170 S variants, and remained in production until 1955, when it was replaced by the 1.9-litre single overhead camshaft inline-4 M121.