M139

Mercedes AMG M139 Turbo Engine

The M139 is AMG’s newest 2.0L turbocharged engine — setting new benchmarks in power-per-liter and reinvigorating AMG’s compact performance platforms.
This page is your source for parts and upgrades built for the M139 platform.

The M139 is a turbochaged inline 4 cylinder engine by Mercedes AMG.  This is a hand built engine and the first 4 cylinder engine to be built in such a way.  It features a very high specific output per liter.

The M139 is based on the M260 engine which is an update of the M270 it is also similar to the M133.  The main differences are the engine is rotated 180 and there are bigger exhaust valves.

This engine was featured in the A45, CLA45, GLC43 2022+, the 2024 GT43, SL 43, and the 2022-2024 C63 S E and GLC 63 S E.

The main ways to increase performance on this model include bigger turbo chargers, high flow catalyst and air intake, increased cooling, and ECU, TCU, and CPC tuning calibration.

Specs & History

  • Displacement: 2.0L turbo inline-4 (evolved from M133 architecture)
  • Output: Factory output in many cases over 415–421+ HP (depending on market and variant)
  • Usage: Introduced in newer AMG models (e.g. A45 S, etc.)
  • Engineering Advances: Improved cooling, stronger internals, optimized ports/flow, better thermal management over M133
  • Potential: Platform built to handle aggressive tuning and higher boost levels with stability

Performance & Upgrade Paths

  • Software calibrations to push stock hardware limits
  • Upgraded cooling / intercooler systems for higher boost
  • Turbo / hybrid turbo upgrades for next levels of power
  • Fueling support for high ethanol or aggressive maps
  • Exhaust and downpipe systems to reduce backpressure

Why Upgrade the M139?

  • State-of-the-Art Platform: Designed for performance, the M139 handles aggressive tuning better than its predecessor.
  • Higher Ceiling: With improved internals and cooling, it has more headroom for high-power builds.
  • Modern Efficiency: As a newer platform, the upgrades tend to yield lower thermal degradation per boost.

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