There’s no reason or need to go any faster than anyone would in the S63, a car that even shares much of the S65’s sportified body and interior modifications.
But that big meaty V-12, with all of its 621 hp and monstrous 738 lb-ft of torque, makes the S65 AMG the undisputed flagship of the S-Class coupe line. More importantly, it gives Mercedes-Benz a suitable, 12-pot answer to the 616-hp Bentley Continental GT Speed and the 624-hp Rolls-Royce Wraith.
The S65’s 6.0-liter V-12 is actually the same engine that powered the outgoing CL65 AMG, with no significant changes. None, really, were needed, of course, given its potency.
Stuffed into the wheelwells are gorgeous 16-spoke turbine-style 20-inchers wrapped by 255/40 front and 285/35 rear tires. Park one next to the cheaper, V-8-powered S63 AMG and only eagle-eyed Benz-ophiles will know that the S65 AMG is packing an extra four cylinders, 44 horses and 74 lb-ft of torque (hint: look for the “Biturbo V12” badges on the fenders, or the “S65” badge on the deck).