The OM613 is a turbocharged straight 6 diesel engine produced by Mercedes-Benz.

The OM613 was developed alongside the four-cylinder OM611 and five-cylinder OM612 engines.

The three engines have the same basic design and share components such as the pistons, fuel injectors, and glow plugs.

[1] The OM613 engine features 4 valves per cylinder, dual overhead camshafts, oxidation catalytic converter, and exhaust gas recirculation.

[2] Models with the engine are branded as '320 CDI'.