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In-depth reviews

Audi A8 saloon - Engines, drive & performance

Power and speed blend with comfort and surprisingly sharp reflexes in the Audi A8

Carbuyer Rating

4.0 out of 5

Owners Rating

3.2 out of 5

Read owner reviews
Engines, drive & performance Rating

4.0 out of 5

The Audi A8 isn't intended to offer the last word in driving excitement, but luxury cars like this still need to blend comfort and quietness with an enjoyable experience from behind the wheel. The early production cars we've tried so far appear to have judged the balance quite nicely.

The A8 is a heavy car, but still feels manoeuvrable thanks in part to a four-wheel steering system. This turns the rear wheels in the opposite direction to the front wheels when driving at low speeds, reducing the A8's turning circle for greater agility – particularly noticeable on tight urban streets. It's fair to air the old cliche of the car shrinking around you, and the sensation is very similar to that delivered by the Audi A4 until the A8's greater weight and width becomes apparent at higher speeds. Powerful brakes reassure you that all the bulk will be kept in check, though, and they stand up to repeated strong applications without showing signs of fade.

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Compared to the uncannily soft ride of an S-Class, the A8 has a very slightly firm edge, although not one that you could ever call obtrusive. This slight cloud comes with the silver lining of impressive body control, with very little body lean even during the enthusiastic hard cornering that the A8 can cope with. Such exuberance is encouraged by accurate steering with a nice weight to it, confirming that Audi definitely hasn't overlooked driver appeal; although, a Bentley Flying Spur will provide you and your chauffeur with greater thrills.

Audi A8 diesel engines

A 3.0-litre diesel engine has always been a popular choice in the Audi A8 and in the latest offering doesn't seem likely to change that. The 50 TDI produces 282bhp and loads of pulling power from the moment you put your foot down. It can take the hefty saloon from 0-62mph in 5.9 seconds, with seamless gearchanges from an eight-speed automatic gearbox.

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Similarly unobtrusive is the mild-hybrid system featured in all regular versions of the A8. Utilising the A8's 48-volt electrical system, it employs a starter-generator in the engine compartment that allows the engine to be turned off when the car is coasting along, as well as at a standstill – such as waiting at traffic lights. The moment power is called upon, the engine restarts without hesitation, making the experience fairly natural in feel.

Petrol engines

Only one petrol engine is offered in the standard A8 line-up, the mysteriously named 55 TFSI that's in fact a 3.0-litre V6 developing 335bhp. It's extremely quiet even when pushed hard, emitting a polite growl when full power is called for. If luxury appears above economy on your list of priorities, then choose this engine over the diesel. The 0-62mph sprint is dispatched in 5.6 seconds, and – as with the 3.0-litre diesel – the eight-speed automatic gearbox changes gear so smoothly you don't notice it happening.

The S8, which we’ve reviewed separately, gets a hugely powerful 4.0-litre twin-turbo V8 petrol. In other markets, the A8 is also available with a 453bhp version of the V8. The range-topping S8 gets a predictive air suspension system that uses a camera to predict how to react to the road ahead, and can adjust in corners to counteract any body roll. It worked really well on our test-drive, so it’s a shame you can’t order it on any other A8.

Hybrid engine

Alongside the petrol and diesel Audi A8 engines, both of which use mild-hybrid technology, the 60 TFSIe plug-in hybrid is the only A8 that offers pure-electric silent running. It combines a 3.0-litre V6 TFSI petrol engine with a lithium-ion battery and 134bhp electric motor for greater fuel efficiency and a maximum output of 456bhp. Power is fed to the quattro all-wheel-drive system via an eight-speed gearbox. The car takes 4.9 seconds to get from 0-62mph and goes on to a limited top speed of 155mph.

The powertrain’s performance is considerable, with effortless overtaking and acceleration thanks to the combined power of the petrol engine and electric motor. At slower speeds is where the 60 TFSI e really excels, with the near silent electric running making it very relaxed and refined. The adaptive regenerative braking system also works intelligently, switching between regen mode and friction braking seamlessly when you apply the brake pedal.

While the transition between electric and hybrid power is mostly smooth and refined, the petrol engine switching on does make a noticeable V6 thrum from the front of the car, and gearchanges can be a little noisy when accelerating hard from a standstill if you’re relying solely on the petrol engine. On the super-smooth roads of Germany, the adaptive air suspension fitted to our test car dealt with road imperfections well. However, the extra weight of the PHEV powertrain can be felt slightly when cornering with some noticeable body lean, which is relatively well controlled. All-in-all, this would be our pick of the range.

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Which Is Best?

Cheapest

  • Name
    50 TDI Quattro Sport 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £81,060

Most Economical

  • Name
    60 TFSI e Quattro Sport 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £92,715

Fastest

  • Name
    S8 Quattro Black Edition 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £111,755
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