[2] It now features port injection,[clarification needed] larger turbochargers, changes to the valvetrain timing, and a new exhaust system for improved efficiency and emissions.

[5] Starting the 2014 model year, M279 has been extensively redesigned and updated their top-of-the-range V12 engine to better conform to increasing emission standards in Europe and the United States.

According to Mercedes-Benz, the most important features of the new engine are: - Increased displacement to 6.0 L (5,980 cc)- New forged pistons and forged crankshaft in high-grade quenched, tempered steel- New Engine Control Unit- New Ignition system- New Camshafts- Hollow-stem sodium outlet valves- Low-temperature cooling-water circulation system with separate expansion reservoir.

[6] With these modifications and the addition of Mercedes-Benz's 7G-Tronic transmission on the V12 models, it is estimated that fuel economy will rise about 21% on the European cycle for the large-bodied Mercedes vehicles.

The effects of this is a reduction of exhaust emissions, which is also due in large extent to the optimized catalytic converter system.