Road Test

Road Test: 2011 Mercedes-Benz CLS 63 AMG

October 31, 2011

MB CLS 63 AMG 2011_01Although there still is the same 63-badging in the tailgate, this new CLS AMG has a completely new engine. The new powerhouse has eight-cylinders like its predecessor, but otherwise the engine is completely new. Engine’s displacement is just 5.5-litres, or 5461 cubic centimetres to be exact. That is 747cc less than the previous, 6208cc engine. The other major difference is that while the previous 6.2-litre V8 was naturally aspirated, this new V8 is turbocharged. The two exhaust gas turbochargers are located next to the cylinder banks to supply the eight cylinders with fresh air. Under full load, when running at maximum speed of 185 000rpm, the two turbochargers force 1750 kg of air into the combustion chambers per hour.

When needed, the new 5.5-litre turbocharged V8 develops 525 horsepower and 700 Newton metres of torque. This is 11 hp and 70 Nm more than in the previous model with the naturally aspirated 6.2-litre V8. Eventhough the new engine is more powerful, it is clearly more economical. The average fuel consumption is just 9,9 litres per 100 kilometres. This sounds almost unbelievable. Getting more power is one thing, but dropping the fuel consumption at the same time by 4,6 litres or 32 percent is amazing. The CO2 emissions have made a major drop as well; from 345 g/km to 231 g/km. It’s nice to know that CLS 63 AMG can be very economical, but that probably is not the reason why buying for AMG. The new CLS 63 AMG can sprint from zero to hundred in 4.4 seconds and the top speed is electronically limited to 250 km/h.

If you don’t think that 525 hp and 700 Nm are enough, there is an AMG Performance package available to improve engine’s performance even further. With the AMG Performance package the engine’s maximum charge pressure is raised from 1.0 bar to 1.3 bar. Now you have 32 hp and 100 Nm more. The CLS 63 AMG with the AMG Performance package produces 557 horsepower and mighty 800 Newton metres of torque. The acceleration from zero to hundred takes now 4,3 seconds. However the top speed is still limited to 250 km/h. The consumption figures should be the same as without the Performance package.

The engine is so powerful, that it is almost impossible to get to use all its performance when driving on the road. You can enjoy from the feeling of acceleration only briefly, if you wish to stay within the speed limit, as the speed gathers pretty fast. And those moments, when you can push the throttle to the floor, are quite rare. First make sure that there is enough room in front of you, and be prepared that the rear end might loose the grip, even with the traction control on. The best torque is available between 2000-4500rpm and when the 800 Newton metres of torque are delivered to the rear axle through the 7-speed automatic transmission, the rear wheels have a quite a big job trying to maintain the grip. The front tyres are 255mm wide and the rear tyres 285mm wide. Low profile tyres are wrapped around 19 inch titanium grey painted light-alloy wheels. To make sure that the CLS 63 AMG stops as quickly as it accelerates, the car is equipped with a AMG high-performance braking system. The car has 360mm, internally ventilated and perforated brake discs all-round. To provide even more stopping power, the optional AMG ceramic high-performance composite braking system with even larger brake discs is also available.

The CLS 63 AMG distinguishes itself from the other CLS variants with its special front apron, distinctive bonnet and wider mudguards with “V8 BITURBO” logo. Looking rrom the rear, the car can be recognised from the diffuser insert, the spoiler lip and from the AMG sports exhaust system with dual twin chrome tailpipes. If the car is equipped with the AMG Performance Package, it comes with the genuine carbon fibre AMG engine cover, genuine carbon fibre AMG spoiler lip on the boot lid and with red-painted brake calipers.



  • Petrol
  • 8-cylinder
  • 5461cc
  • Biturbo


  • 410 kW (557 hp) / 5750rpm


  • 800 Nm / 2000-4500rpm


  • 7-speed automatic
  • RWD

0-100km/h / 0-62mph

  • 4.3 seconds

Top speed

  • 250 km/h

Fuel consumption

  • 9.9 l/100km

CO2 emissions

  • 231 g/km

MB CLS 63 AMG 2011_06