The Porsche Panamera Turbo and next-gen Audi RS7 now have the new Mercedes-AMG GT 4-Door to contend with.

The Mercedes-AMG GT 4-Door has been revealed at the Geneva motor show. Making use of the company’s technological arsenal to do battle with the Porsche  Panamera Turbo and Audi RS7, the GT 4-Door is the third bespoke model to emerge from Mercedes-AMG after the SLS and the two-door GT. 

AMG says the GT 4-Door is a direct relation to those cars, and should mimic their supercar drama in a more practical body. At its core, though, the GT 4-Door is more closely related to its traditional saloon cousins than Mercedes might want to admit. Underpinned by a version of the MRA platform that is used by everything from the C-class to the S-class, the structure is not related to the aluminium-intensive chassis of the GT coupe.

> Click here to read our review on the Mercedes-AMG GT R 

This in part is due to the 4-Door’s adoption of all-wheel drive, an element that would be difficult to engineer-in if the car utilised a transaxle-mounted gearbox as in the two-door GT. As a result, the GT 4-Door loses the elongated bonnet and cab-backwards stance of its more exotic two-door sibling, but in the process gains the ability to produce some astounding performance figures thanks to all-wheel drive traction.

At launch, Mercedes-AMG will offer three powertrain options: two V8s – the GT63 and GT63 S – and the hybridised in-line-six powertrain from the recently launched AMG CLS53 for the GT53.

The V8 in the flagship GT63 S is the same M178 4-litre ‘hot-vee’ unit found in the E63 S, although here power has been raised to 630bhp with 664lb ft of torque, resulting in a 0-62mph time of 3.2 seconds and a 196mph top speed. As previously mentioned, power is delivered to the road via the 4Matic+ all-wheel-drive system, which is mated to a nine-speed MCT Speedshift gearbox and also offers a drift mode.

> 2018 Geneva motor show

The slightly detuned GT63 develops 430Kw and 800Nm, again with all-wheel drive. It dispatches 0-100km/h in 3.4 seconds, while its top speed is rated at 310km/h.

The GT53 shares identical figures to the CLS53, which means that despite its entry-level status, this model supplies plenty of performance – 0-100km/h in 4.5 seconds, 285km/h at the top end – while the hybrid tech allows it adequate fuel consumption of around 31mpg. The 320kW and 520Nm efforts of the petrol engine are bolstered by an ‘EQ boost’ of up to 15kW and 250Nm when required.

All models hover around the two-ton mark, the GT63 S being heaviest at 2045kg (DIN) and the six-cylinder GT53 being the lightest at 1970kg, despite its battery pack and electric motor.

Aesthetically, the front end features the familiar wide grille and low-set headlights of the two-door GT and the slim tail lights also evoke the more compact coupe. As standard there’s an active rear wing, although an optional aero package will replace this with a rather heavy-handed fixed item if you so wish.

Inside the cabin – which is accessed through coupe-like frameless doors – there’s been a similar transformation in the move to four doors, with a dashboard layout combining elements of both the existing GT and Mercedes’ more conventional models like the E-class.

From the former we get the raised, prominent centre console layout with its clear physical controls and slightly awkward, backward-set gear selector, while the latter has influenced the wide TFT display that stretches from the driver’s instrument panel to the middle of the dashboard, and a set of four central air vents that echo those of the E-class coupe.

And, of course, you get a pair of extra seats in the back, bringing with them an element of practicality as yet unavailable in the GT range. For its exterior styling and interior layout alone, the GT 4-Door is likely to find plenty of fans, but if you were hoping for a more distinctive interior on the lines of the Porsche Panamera’s for your extra cash, you’ll be disappointed.

New in the GT 4-Door is the option of a more performance-orientated steering wheel than that of the E63 S. It features a drive mode selection switch, which contains a small, round screen to tell you which mode you’re in. This is matched by the placement of buttons for the sports exhaust and gearbox mode on the other side.