M139

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.

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