The Mercedes-AMG GLE 63 S and Mercedes-AMG GLS 63 have received a mid-life overhaul, the headline act a new ‘M177 Evo’ flat-plane-crank twin-turbo V8.

Previous versions of the GLE 63 and GLS 63 were powered by an older-generation of the M177 V8, the new Evo engine has been engineered for improved efficiency to meet tough new Euro7 emissions regulations.

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The new engine has been heavily revised with a flat-plane crankshaft, modified camshaft, new air intake and exhaust ports, upgraded fuel-injection system, revised compressor and turbocharger housing, and new cylinder firing order. The latter is claimed to reduce engine vibration with smoother power delivery.

Making the same 450kW and 850Nm as before, the modified V8 retains the mild-hybrid tech of the previous version for an additional boost of 17kW and 205Nm.

AMG’s nine-speed automatic transmission is carried over and delivers outputs to all four wheels via Mercedes-AMG’s 4Matic all-wheel drive system.

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Performance remains unchanged, with the GLE 63 S sprinting from 01–0km.h in just 3.9 seconds, while the slightly larger and heavier GLS 63 covers the dash from standstill to 100km/h in 4.2 seconds. Top speed remains unchanged, both models quoted at 280km/h.

Both models have been given a facelift, with a new AMG front grille, larger air intakes and redesigned headlights. The exhaust system has also been modified, with a petrol particulate filter (PPF) and exhaust flaps that automatically adjust to boost engine sound.

Both updated models have been confirmed for an Australian launch, with deliveries expected to start in 2027.

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The current Mercedes-AMG GLE63 S line-up is priced from $273,300 before on-road costs for the SUV wagon and $275,300 (plus on-roads) for the Coupe body style. The Mercedes-AMG GLS63 starts from $307,100 before on-road costs.