Mercedes-AMG has confirmed that the 2027 GLE63 S and GLS63 will adopt a flat-plane crank V-8 engine, marking a significant powertrain shift for the brand's performance SUV lineup. This new engine replaces the cross-plane crankshaft design that has powered previous generations.
The flat-plane configuration delivers a higher-revving character and more aggressive exhaust note compared to traditional cross-plane engines. This design choice aligns with AMG's pursuit of sharper throttle response and a more visceral driving experience. The shift reflects broader industry trends toward extracting maximum performance from internal combustion engines as manufacturers face stricter emissions regulations.
Specific displacement and output figures remain unconfirmed, though sources suggest the engine will maintain competitive horsepower levels against rivals like the BMW M760i and Range Rover Sport SVR. Flat-plane cranks historically enable engines to reach higher RPM limits more efficiently, a factor that likely influences power delivery across the rev range.
Beyond the powertrain, Mercedes-AMG has reimagined the interior architecture for 2027. The cockpit balances large touchscreen displays with retained physical controls, a deliberate approach that acknowledges driver preference for tactile interface elements. This hybrid philosophy contrasts with competitors who have increasingly eliminated conventional buttons in favor of fully digital environments.
The GLE63 S and GLS63 serve different market segments. The GLE63 S targets sport-oriented buyers seeking a three-row performance SUV, while the GLS63 addresses the luxury full-size segment with seven-seat practicality and AMG performance credentials. Both vehicles compete in fiercely contested categories where powertrain personality and interior ergonomics directly influence purchasing decisions.
The flat-plane engine adoption positions these SUVs as more engaging alternatives to their predecessors while maintaining the