Mercedes has announced the details of its range topping S-Classes – the 63 and 65 AMGs.

The ‘lesser’ of the two, the S 63, is fitted with the 6.2-litre naturally aspirated AMG V8 offering 525bhp and 465lb ft, while the top of the range S 65 gets the twin-turbocharged 6-litre V12 delivering 612bhp and 737lb ft, or a nice round 1000Nm of torque. The S 63 will hit 62mph in 4.6 seconds, the V12 takes a couple of tenths less, hitting the benchmark in 4.4 seconds. Both are limited to 155mph and both see a three percent improvement in both fuel economy and CO2 emissions over the older versions.

Power is put on the road via the AMG Speedshift seven-speed automatic in the S63, but the 1000Nm of the V12 still requires the fitment of the older five-speed torque convertor. Both can be operated manually via a pair of aluminium paddles behind a new steering wheel.

Both models get the usual AMG visual makeover with new front and rear bumpers, side skirts, extra ventilation for the motors, unique wing mirrors, the now-traditional quad exhausts and 6.3 AMG or V12 Biturbo badges on the front wings. The 63 gets 19-inch, multi-spoke titanium grey ‘high sheen finish’ rims while the 65 gets 20-inch five-spoke titanium grey ‘mirror finish’ forged items.

Both also get crosswind stabilisation, active braking and active steering.

The S63 costs €115,700, with a €6000 premium for the long wheelbase version, while the S65 is only available in long wheelbase for €185,900 – all excluding local taxes.

The AMG S-Classes will be available from the end of this month.