Mercedes-Benz’s 53 Inline-Six Plug-in Hybrid Is The Most Powerful Six-Cylinder Engine

With environmental concerns being arguably the largest factor driving modern engine development, it shouldn’t come as a surprise that most powerplants are getting smaller and more efficient by the year. Larger and naturally aspirated engines are becoming few and far between, with more compact four and six-cylinder engines equipped with turbochargers and hybrid systems becoming ever more prevalent throughout the automotive kingdom. This is the most powerful inline-six configuration currently on sale in 2026, with the winner claiming the crown purely due to its potent electric setup.