3 publishers · first seen Tue, 27 Oct 2026 18:25 UTC · updated Thu, 29 Oct 2026 07:37 UTC
Mercedes has introduced the M 252 LS engine with an electrically assisted turbocharger in the GLB 250, marking the technology's debut in regular Mercedes models. The system, developed using expertise from Mercedes-AMG High Performance Powertrains and its Formula 1 program, delivers 228 horsepower from the 1.5-liter four-cylinder engine plus an additional 31 hp from the electric turbocharger. It improves throttle response, reduces turbo lag, and cuts CO₂ emissions by about 17 percent compared to the previous M 260 engine. The electric turbocharger can recover up to 2 kW of energy from exhaust gases, converting it into electricity. This feature helps offset the system's added complexity, weight, and cost. The technology is part of Mercedes' strategy to enhance combustion engine efficiency and performance. Porsche also uses electric turbocharging in the 911 GTS and 911 Turbo S models.
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