Mercedes-AMG has equipped its 2027 GLE 63 S and GLS 63 SUVs with a flat-plane crank V-8 engine, marking a significant powertrain shift for the high-performance division's largest models. The flat-plane configuration delivers the rev-happy characteristics and distinctive exhaust note typically associated with track-focused machinery, now adapted for the luxury SUV market.
The GLE 63 S targets the midsize premium SUV segment, while the GLS 63 attacks the three-row category. Both vehicles inherit AMG's performance DNA through this engine architecture, which uses crankpins arranged at 180-degree intervals. This design reduces reciprocating mass and delivers sharper throttle response compared to traditional crossplane cranks, traits that AMG has refined in its C 63 and E 63 sedans.
The flat-plane V-8 addresses shifting consumer preferences in the luxury performance space. Buyers of $100,000-plus SUVs increasingly demand visceral driving experiences without sacrificing utility. Mercedes-AMG positions these models against competitors like the BMW X5 M and Porsche Cayenne Turbo, both of which prioritize acceleration and handling despite their size.
Power outputs and transmission details remain under wraps, though expect figures competitive with AMG's existing V-8 lineup. Historical context suggests the engine will produce north of 600 horsepower, channeled through AMG's proven nine-speed automatic transmission with standard all-wheel drive and active differentials.
The flat-plane approach carries manufacturing complexity and cost implications. Mercedes-AMG engineers had to reconcile the engine's linear power delivery with the substantial mass of full-size SUVs, requiring careful suspension tuning and brake engineering. The sound signature alone serves as differentiation in a market segment where competitors often rely