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New look, new platform, new powertrain tech, new four-wheel drive system and even new naming for Audi’s compact executive estate

In some ways, the S5 is reassuringly familiar, because here stands a compact estate car with a petrol V6 engine. Beruhigung durch Tradition, or something. Actually, that’s not fair, because there are plenty of changes from the old S4.

First off, this car isn’t actually all that compact any more. It has grown 67mm in length and 13mm in width, making it very similar to an early-2000s Audi A6. It remains manageable, but I can’t help but wonder where the bloat will stop.

The cars in the photos are not equivalent to any UK trim level, but most of them have the S Line look (with the large silver triangular trim pieces in the bumper) or Edition 1 look (with the black version). Sport trim gets more subtle, smaller versions.

We can’t even blame an all-new platform, because while it has a new name (Premium Platform Combustion, or PPC), it’s really an evolution of what went before.

The A5 remains slightly unusual among similarly sized Volkswagen Group cars (like the Skoda Superb and VW Passat) in carrying its engine lengthways rather than transversely. This layout enables it to have that V6, send most of its power to the rear wheels if the situation calls for it and ride on more sophisticated suspension (four-link front, five-link rear) than an MQB-based car.

The most interesting development is in the powertrain. The 3.0-litre V6 is fundamentally a familiar one, but it’s now a hybrid. Audi calls the new hybrid system MHEV Plus, even though it’s not mild at all. As well as the usual integrated starter-generator that handles the start/stop, there’s an electric motor acting on the output side of the gearbox that can regenerate up to 25kW of energy and contribute 25bhp, either to augment the engine or to power the car by itself and allow the engine to shut off.

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There are knock-on effects too. Because the motor can fill some low-rev torque gaps and the turbo now has variable geometry (for more low-down shove), the engine no longer needs the capacity for torque multiplication that a torque converter gives. As a result, Audi has ditched the eight-speed automatic gearbox for a seven-speed dual-clutch unit, which it says is more efficient.

Power goes to all four wheels, as you would expect in a sporty Audi, but it now does so through a clutch pack, rather than the traditional centre differential, and at the back there’s now an electronically controlled limited-slip differential.

As usual, the standard A5 comes with a wide choice of powertrains, which often used to be a confusing affair to identify with Audi. But it has now ditched its 30/35/40/45/etc nomenclature to indicate the power level and instead it refers simply to the output in PS, which is much more logical.

As such, in the UK there’s a 2.0-litre petrol with front-wheel drive and either 150PS (148bhp) or 204PS (201bhp). If you want Quattro four-wheel drive, you will have to either shell out for the S5 or go for the 201bhp 2.0-litre four-cylinder turbo diesel, which gets it as an option.

A pair of plug-in hybrids are on the way as well, but Audi won’t say anything about them other than that they will have 295bhp and 362bhp and an electric-only range of more than 70 miles.

Visually, the new A5 and S5 clearly belong to a new generation of Audi, with softer lines and a reinterpreted ‘single-frame grille’. Audi’s long-standing design cue has got wider and is flanked by triangular inserts in either black or silver, depending on the trim level.

The saloon actually isn’t a traditional three-box one now, having traded its traditional bootlid for a big ‘liftback’ hatch, thus taking the baton from the outgoing A5 Sportback.