Audi's A8 has long been the big saloon to choose if discretion and understatement work for you. Is that still the case? Jonathan Crouch looks at what's on offer from the revised version of the fourth generation design.

Ten Second Review

The improved version of Audi's fourth generation A8 is smarter, more efficient and well up to the segment standard in its use of autonomous driving technology. Better established badges in this sector may be tempting, but they often can't offer some of the features this car brings to the full-sized Luxury saloon segment: all-wheel steering and an active suspension system are just a couple of examples. In short, there ought to be enough here to please the most demanding boardroom buyer.

Background

Audi is used to winning. It's got extremely good at it, continuing to push technological boundaries wherever it can to stay a step ahead of its rivals. And the best place to see Vorsprung Durch Teknic at work? Well it has to be here doesn't it, with the brand's top A8 large luxury saloon, further improved in this evolved fourth generation form.

It's hard to remember now, but prior to this A8's original launch back in 1994, Audi wasn't really considered a fully-fledged prestigious brand. The first generation A8 changed all of that, a car the like of which the luxury segment had never seen before. Aluminium spaceframe technology from NASA. 4WD quattro technology from the World Rally Championship. And exquisite standards of build quality that redefined what boardroom buyers could expect from a European luxury car. At a stroke, it put posh rivals on the back foot - and Audi has never looked back since. The second and third generation A8 saloon merely perfected the recipe, but this MK4 'D5'-series model, first launched in 2017, took a real step forward once again. Has Audi further perfected it in this facelifted form? Let's find out.

Driving Experience

The array of engines you get in the latest A8 is pretty mouth-watering and as before, everything's mated to 8-speed tiptronic auto transmission and quattro 4WD. As before, the mainstream line-up is based around two V6 turbo engines. Either a 3.0 TDI diesel (in the 50 TDI) with 286PS: or a 3.0 TFSI petrol unit (in the 55 TFSI) with 340PS. A 60 TFSIe quattro PHEV variant is also offered, this derivative mating a 3.0 TFSI petrol engine with an electric motor to achieve a 462PS output and 700Nm of torque. The 60 TFSIe now has a much larger 14.4kWh battery for a longer all-electric driving range and goes from rest to 62mph in just 4.9s. The other option is the S8, which uses a 571PS 4.0-litre petrol V8 and generates 800Nm of torque. The S8 sprints to 62mph in just 3.8s.

On the move, dynamic all-wheel steering complements the standard quattro permanent all-wheel drive system and buyers also get Audi AI active suspension, a fully active suspension set-up. Depending on the driver's wishes and the driving situation, it is capable of raising or lowering each wheel separately with electric actuators. This newfound latitude enables it to deliver the polished ride comfort of a classic luxury saloon and the taut, composed agility of a more driver-oriented performance car in equal measure. It's clever. It's an Audi. What else did you expect?

Design and Build

This fourth generation A8 signalled the beginning of a new design era for the entire brand and this revised model aims to continue that visual evolution. To that end, there's a larger Singleframe front grille, a restyled front bumper, smarter side skirts and a sleeker rear valance at the back. The LED headlamps are also restyled - and can be upgraded to Audi's latest Digital Matrix LED status where each light unit contains 1.3 million micro mirrors. The smarter rear lights meanwhile, have a built-in proximity sensor which activates them if a following vehicle gets too close. As before, two bodystyles are available, the 5.17-metre 'standard' version and the A8 L, which has a 13cm-longer wheelbase.

Inside, occupants can also now relax in even more sublime surroundings, with every detail radiating superlative bespoke quality - from the perforation in the seat upholstery to the electrically opening and closing shutters on the air vents. Up-front, the instrument panel is largely free of buttons and switches. As before, there's a 12.3-inch Digital Cockpit instrument screen, plus two centre monitors, a 10.1-inch one for the media functions and a lower 8.6-inch unit just for the climate controls. All three screens now run on updated software.

Market and Model

Prices start at just under £75,000 - add £4,000 if you want the lengthier long wheelbase bodystyle. There are two main trim levels, 'Sport' and 'S line', then top 'Black Edition' for standard shape models and 'Vorsprung' for long wheelbase models. Across the range, there's an improved "Hey Audi" voice control system and media connectivity is now served by a faster MIB 3 software system. Plus online and Car-2-X services from Audi connect augment the navigation system. Unlike in an S-Class, you can add rear seat screens - two 10.1-inch HD monitors attached to the front seat backs.

Standard drive tech includes the 'Tour' assist package, which includes adaptive cruise assist - this adjusting longitudinal and lateral guidance throughout the vehicle's speed range. The optional 'City' assist package includes intersection assist, cross-traffic assist, side assist, exit warning, and the Audi pre sense 360° safety system, which induces a side crash enhancement in combination with the active suspension.

Cost of Ownership

All the conventional A8 engines operate in conjunction with a belt alternator starter, which is the nerve centre of the 48-volt electrical system. It also has an extended start/stop function and an energy recovery output of up to 12kW. The combined effect of these measures is to improve efficiency substantially.

Let's get to the WLTP figures. The 50 TDI diesel delivers up to 40.9mpg on the combined cycle and up to 180g/km of CO2. The 55 TFSI petrol version manages up to 28.8mpg and 223g/km. For ultimate efficiency though, you'll want to talk to your Audi Centre about the A8 60 TFSIe quattro version, which uses a powerful plug-in petrol/electric hybrid drivetrain. Audi residuals are usually strong.

Summary

Is it a car that you could bond with, a luxury conveyance to love as well as admire? Hugely capable, innovative and beautifully built, this is the car that rivals always feared Audi would build. And if you're in this market, it's one you need to try.

FACTS AT A GLANCE

CAR: Audi A8

PRICES: £74,985 - £117,610

INSURANCE GROUPS: 44-50

CO2 EMISSIONS: 40-254g/km

PERFORMANCE: [A8 3.0 TDI quattro] 0-62mph 5.9s / Max Speed 155mph

FUEL CONSUMPTION: [A8 3.0 TDI quattro] (combined) 50mpg [est]

STANDARD SAFETY FEATURES: Eight airbags, anti lock brakes, stability control, Pre-Sense.

WILL IT FIT IN YOUR GARAGE?: Length/Width/Height 5190/1945/1473 mm