MERCEDES-BENZ GLE 63 AMG S 2021 - This is an all-new GLE 63 S Coupe, based on the GLE generation introduced The GLE, or ML, as it was previously known, It's entirely new from the ground up, including the engine. The previous-generation GLE 63 Coupe still used the old 5.5-liter twin-turbo V8, while the new model uses the smaller but more powerful 4.0-liter with better specs than the outgoing mill. The GLE Coupe, with its egg-shaped shell, just doesn't do that for us. But that didn't stop us from spending a week with one in our driveway to find out all about it.