2017 Audi A8 revealed as brand's most high-tech model yet

The new A8, which is codenamed D5 within Audi, follows an evolutionary design path. Its exterior appearance blends a number of newly interpreted elements from the earlier Audi Prologue concept car — including a heavily reshaped grille, tauter surfacing and a new tail-light treatment — with time-honoured cues from earlier versions of the Audi flagship.

As with the third-generation model, on sale in the UK since 2009, the new A8 will be sold with the choice of two wheelbases. Both are 6mm longer than those of the old A8, at 2998mm and 3128mm.

At 5172mm long, 1945mm wide and 1473mm tall, the new A8 is 37mm longer, 4mm narrower and 13mm taller than its predecessor in standard guise. The A8L’s 130mm-longer wheelbase extends its length to 5302mm, with added ride height bringing 4mm to its height, at 1488mm.

The body of the new A8 makes use of more materials than any previous Audi model. Aluminium makes up 58% of the structure, but it also adopts steel, magnesium and carbonfibre, which forms the basis of the rear bulkhead.

Audi to launch on demand car service in UK later this year

Inside, the new Audi has a clean and contemporary-looking dashboard, a redesigned multi-function steering wheel and touchscreen controls closely modelled on those first seen on the Prologue concept car.

Highlights include new front seats that are 4kg lighter than those in the old A8, high-definition digital instrument graphics and a revised MMI (Multi-Media Interface) system with two separate displays — one measuring 10.1in and the other an 8.6in curved unit.

There’s also a second-generation MIB infotainment system that uses a quad-core processor from Nvidia and is claimed to be 50 times faster than the first-generation unit.

The A8 will be offered with the choice of two turbocharged V6 engines from the outset of sales in October. One is a 3.0-litre petrol unit developing 335bhp in the 3.0 TFSI and the other a 3.0-litre diesel with 264bhp, 10bhp more than its predecessor, in the 3.0 TDI. 

Both engines are allied to an eight-speed automatic gearbox and quattro four-wheel drive, which can be ordered with an optional sport differential.

The new standard-fit 48V electrical system offers a range of mild hybrid functions, including engine-off coasting, extended start/stop operation and kinetic energy recuperation under braking, via a belt-driven alternator.

In early 2018, a further diesel will join the line-up in  the form of a turbocharged 4.0-litre V8 with 429bhp in the 4.0 TDI. That’s 44bhp more than the old turbo 4.2-lite V8 engine that it replaces.

The biggest engine in the line-up will be a 6.0-litre petrol W12. This revised version of the Volkswagen Group’s turbo W12 is 300cc smaller than its predecessor yet it delivers an added 85bhp, at 585bhp.

Although it has yet to be confirmed, a successor to today’s S8 is set to run a powered-up version of the 4.0-litre turbo petrol unit used by the 4.0 TFSI. It will develop around 542bhp, 22bhp more than the outgoing model. The same engine is already used by Audi’s Volkswagen Group sister company Porsche in the latest Panamera Turbo.