Under the hood of the GLS63 sits the same 4.0-liter twin-turbo V8 found in a variety of AMG models producing 603 horsepower and 627 lb-ft of torque. With a nine-speed automatic and an AMG-tuned 4MATIC+ all-wheel-drive system, Mercedes says the GLS 63 takes just 4.1 seconds to hit 60 mph on its way to a 174 mph top speed. Independent tests, however, have measured the 0-60 time closer to 3.6 seconds. Making the V8 even smoother is a 48-volt mild-hybrid system, which helps combat turbo lag and smooths out the stop/start system.
It may have an AMG badge but the GLS63 is still a luxury car first and foremost. 23-inch wheels would normally disturb ride comfort but the air suspension is still well-calibrated to keep passengers comfortable. In Sport+ mode, the 48-volt mild-hybrid system helps keep the suspension level, making the GLS 63 feel far more nimble than you'd expect.
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