Mercedes-Benz OM457 engine

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The Mercedes-Benz OM457 is a 12.0-liter inline‑six diesel engine introduced in 1998 as part of the 400 series. It is an improved, electronically managed version of the OM447, built with a cast‑iron block and heads, wet cylinder liners, direct fuel injection, and a single Borg‑Warner turbocharger. The engine is water‑cooled and uses an 18.5:1 compression ratio within an OHV valvetrain. It runs on diesel fuel and meets emissions targets up to Euro V or IMO IV using BlueTEC selective catalytic reduction with diesel exhaust fluid.

Power output ranges from about 185 to 335 kW (252–455 PS; 248–449 hp) and torque from 1.1 to 2.2 kN·m (811–1,623 lb‑ft), depending on the trim. Idle speed is around 560 rpm and maximum engine speed around 2300 rpm. The OM457 powers a wide variety of applications, including trucks, buses, ships, military, municipal work, agricultural machines, and stationary installations. Some buses use a horizontally mounted version known as OM 457 hLA. The engine’s predecessors and successors are the OM447 (predecessor) and the OM460 (upstroked to 12.8 L) or OM471 (successor).