Mercedes-Benz S-Class to Receive AMG-Style Flat-Plane Crank V8 in 2026 Overhaul: A Deep Dive into the Future of Luxury Sedans
The Mercedes-Benz S-Class, a symbol of automotive luxury and innovation, is set to undergo a significant transformation in 2026. According to recent reports, the upcoming model will be powered by a cutting-edge V8 petrol engine with a flat-plane crankshaft, marking a bold departure from traditional designs.
This update is part of what Mercedes-Benz describes as the "most extensive update in one generation," promising a substantial improvement in performance and technology. The current seventh-generation S-Class is expected to receive a major overhaul, including a refreshed exterior, an enhanced interior, and the highly anticipated V8 engine.
The Power of Flat-Plane Crankshafts
The flat-plane crankshaft is a game-changer in internal combustion engine (ICE) design. It not only gives the engine a unique sound but also offers several performance advantages. By reducing weight and allowing for faster spinning, it enables the engine to rev higher and respond more quickly, resulting in improved acceleration and overall driving dynamics.
Mercedes-AMG made a similar move with the 2020 AMG GT Black Series, where the 4.0-litre twin-turbocharged V8 produced an impressive 537kW and 800Nm of torque. The new S-Class engine, codenamed M177, will follow suit, offering enhanced performance while retaining the 4.0-litre capacity and twin turbochargers.
M177 Engine Family: Cross-Plane to Flat-Plane Transition
The M177 engine family, currently found in cross-plane form in several Aston Martin models, is set to make its way into the S580 with a mild-hybrid setup. This transition to a flat-plane crank is expected to contribute to reduced emissions, aligning with Mercedes-Benz's commitment to future-proofing its engines.
The M177 engine will deliver more power than its predecessor, with output rising to around 395kW, enabling a claimed 0–100km/h acceleration time of approximately 4.0 seconds. This significant improvement in performance positions the S-Class as a formidable competitor in the luxury sedan market.
2026 S-Class: A Blend of Power and Efficiency
While the 2026 S-Class will be powered by the M177 V8, lower-spec models will initially be equipped with six-cylinder engines. The more potent S63 AMG, however, remains a subject of speculation, with no official details confirmed by Mercedes-Benz. The brand's commitment to V8 and V12 ICE engines, as stated by Chief Technology Officer Markus Schäfer, suggests that the S63 AMG could still be in the pipeline.
Mercedes-Benz Australia has yet to announce the local timing for the updated S-Class, but an update for the V8-powered Maybach SL is expected in the second half of 2026. The brand's focus on both electric vehicles (EVs) and hybridized internal-combustion engines reflects its dual strategy, ensuring a balance between performance and environmental sustainability.
The Future of Mercedes-Benz: EVs and Beyond
Despite the continued development of ICEs, Mercedes-Benz remains committed to its EV ambitions. The brand is expanding its electric lineup, including the 1000kW Concept AMG GT XX, an electric supercar that shattered the EV distance world record. Mr. Schäfer's statement in mid-2025 highlights the company's dual focus: "AMG will continue with a dual strategy – two pillars. The electric pillar will grow significantly. But the second pillar – hybridized internal-combustion engines – will also remain."
As the automotive industry continues to evolve, Mercedes-Benz's 2026 S-Class overhaul showcases its dedication to pushing the boundaries of luxury and performance. With the introduction of the flat-plane crank V8, the S-Class is poised to redefine the driving experience, offering a harmonious blend of power, efficiency, and technological innovation.
