BMW X7 vs Audi S8

What's the difference?

When lined up against its direct rivals, the expensive X7 xDrive40d represents reasonable value for money.

It has a unique and bold look and a sumptuous, visually striking and well-appointed interior that has acres of space for family, friends, or for ferrying frequent flyers to the airport. 

That wallop of performance from the big beefy diesel is the cherry on the top. This is how you do a mid-life update. 

The S8's existence is a source of joy for me because it's not a huge SUV. Yes, it's a huge sedan but it's a reminder that the technological flagship is alive and well, at least in Germany. And the important thing about these cars is the way the toys filter down through the rest of the range. That used to take years but we're seeing this cool stuff a lot more quickly, right down to the A1.

The S8 punches, and punches hard in this rarefied part of an already shrunken section of the market - the twin-turbo V8 matches its German rivals, it's lighter and it's as well-stacked as any of the three. What it doesn't do, however, is shout about itself the way the other two do.  It's the incognito choice.

There’s quite a bit that’s interesting about the X7’s design. Especially looking at it front on.

BMW certainly took a bold step when it introduced its toothy grille design for the X7 and the 4 Series range. 

But the Bavarian brand has made some even braver design moves recently by introducing a blocky front-end with split headlights on its new-gen 7 Series flagship sedan. That look has now found its way onto the face of the updated X7.

As with the 7 Series, it won’t be to everyone’s taste. But you can’t deny it has a lot of presence. 

The tail-lights have been tweaked and look good, but the sheer size of the X7 - it’s 5.2 metres long and 1.8 metres tall - means there’s no disguising the fact that it is a big, boxy SUV.

Inside the update ushers in significant design changes. The old dash and cowl is gone in favour of the ‘Curved Display’ that connects the instrument cluster and multimedia. 

New slimline air vents, LED backlit ‘X7’ graphics on the passenger side of the dash, and a new gear shift toggle that replaces the old shifter elevate the cabin and give it a much more modern vibe than the old X7 - one that’s in keeping with the excellent iX electric SUV.

The sheetmetal is obviously very restrained given it's an Audi first, and secondly, it's just not done to go wild in this part of the market.

It's an A6 that's joined a gym, but didn't join that weird gym with men that can't run after you when you insult them (don't ask how I know this). Rolling on 21-inch wheels as standard, you can go up to massive 22s if you so choose.

The A8 created a subtle redirection of Audi's passenger car look, with the updated A4 and A6 both picking up on the horizontal bar between the rear lights and the huge grille framed by family lights with signature DRL patterns. The S8 builds on that with subtle S cues but nothing even vaguely shouty.

The interior acreage - or 'cabin', if you will - is very comfortable, but you already knew that. The multi-screen layout was first seen in the A8 and has now found its way into A7, Q8 and Q7 and is, as ever, brilliant to look at and use.

The MMI updates that have found their way into other cars are present and correct. Like the exterior, it's very restrained but not to the point of sparse minimalism, despite the lack of switches and buttons.

I really don't like the steering wheel, though, and I can't put my finger on why. It certainly isn't especially sporty-looking but I wonder if the standard flat-bottomed S wheel just looked stupid.

The materials are beautiful and everything fits together perfectly.

Regardless of the price point, a three-row SUV needs to be super practical and capable of family duties. 

And if you want a BMW X5 but need a lot more space, this is the next logical step.

Let’s start in the front row. As mentioned, the new X7 gains the screen and tech set-up from other new BMW models like the iX and updated 3 Series. The Curved Display combines a 12.3-inch digital instrument cluster with digital speedo and a 14.9-inch multimedia screen.

You can customise the cluster layout and move things around on the multimedia screen, too. The latter is a touchscreen but you can also find what you need via the 'iDrive' controller in the console.

I have had some experience with this system in the iX and while it’s not without its flaws, it is a top notch system. There’s a lot to wrap your head around, but the use of app icons helps. And you can swipe through to your chosen screen.

It took far too long to work out how to find the trip computer, something that should be much easier to access, as well as a couple of other functions. And the climate controls are housed in the digital screen. I would always prefer a separate space with buttons for air-con.  

But the graphics and displays - including the excellent head-up display - are excellent. 

Other tech you get with the X7 includes the BMW’s 'Digital Key', which is an app that allows iPhone users to lock and unlock their car remotely, and BMW ID driver profile.

If you buy this car, just allow yourself some time to familiarise yourself with all that tech.

Elsewhere up front there’s a lovely new three-spoke steering wheel, and cute touches like the metal air vent toggles, black and metal touches and the choice of inserts.

The front seats are luxurious and comfortable and offer loads of side and thigh support. They have memory functions, too. There’s no shortage of headroom up front, either.

Storage-wise, the door will fit the largest of bottles, as well as other items thanks to generous door bins, while the central lidded box is also sizeable. 

What about that second row?

The X7 xDrive40d usually comes standard with seven seats, but our test car was fitted with the $1500 captain’s chair option which drops seating capacity down to six people.

If you need the extra seating this is not the option for you, but it is great for families with bigger kids, and it would make for an excellent airport transfer car. 

The seats are unbelievably comfortable and can be adjusted to suit your preference. They also have ISOFIX points and armrests. 

Rear seat occupants have access to their own climate controls, air vents, USB ports, cupholders and ample door storage.

There is a massive amount of occupant space as well - stretch those legs out and enjoy it!

One of the X7’s selling points is that it is a genuine three-row SUV. That third row is not just for occasional use for very small children, like so many seven-seat SUVs. That row can be used every day. 

Even with my six foot stature, I could easily climb in and out of the third row. That’s made even easier thanks to the mechanical seat functions.

Just hit the lever at the top of the second row seat and the motor moves the seat forward and up to ensure there’s a big enough aperture to get in and out of the rear seats. 

You can also raise and lower the third row electronically via buttons on the boot wall - and they stow flush into the boot floor. Neat!

Once in the third row, there’s air vents, USB ports, bottle holders and storage and quite comfortable seats with more than enough leg and head room.

There’s even a third row section of the sunroof, operated from the second row. Lots of clever touches that people who use the third row will appreciate.

The boot has a few cool features, too, including a split tailgate.

You can even sit on the lower section - it can handle a load of up to 250kg - a perfect place to sit and watch the polo.

You can lower the suspension to aid loading larger items, and the X7 comes with a space-saver spare wheel.

Capacity is 300 litres with all seats in place, and I easily fit a pair of smaller suitcases in with that configuration. It increases to 2120L with the two rear rows folded. 

The cabin is clearly built with rear seat passengers in mind, with rear leg and headroom configured for those continent-crossing drives.

The S8 has plenty of comfort for two rear seat passengers and a few amusing options to while away the hours in traffic or on the autobahn.

That doesn't mean the front seat passengers are in purgatory, with huge but supportive seats adjustable in all conceivable directions.

Front and rear rows score a pair of cupholders and bottle holders while the boot is a handy, if not awe-inspiring, 505 litres.

For $260,000 there is a lot to get through, as there is on the less sporty A8. Start with huge 21-inch alloys, 17-speaker Bang & Olufsen stereo, panoramic sunroof, matrix LED headlights with laser lights, soft-close doors, acoustic glazing, leather trim, S front seats, extra leather over the A8, Alcantara headlining, carbon inlays, four-zone climate control, heated and cooled front seats, 'Virtual Cockpit' with S mode, and a tyre repair kit.

You also get active suspension, a sport version of the 'quattro' all-wheel drive system (with a sport differential), and a walloping great twin-turbo V8 to get you moving.

A massive touchscreen on the centre stack (familiar in Q8, A7 and Q7) hosts Audi's 'MMI plus' system, which is very good and does away with the console-mounted rotary controller. It also has wireless Apple CarPlay to go with the console-bin wireless charging pad. Android Auto is still USB. 'Audi Connect plus', now in full-featured glory, is also along for the ride.

Another technical highlight is the active noise cancelling which is meant to reduce the noise in the cabin the same way noise cancelling headphones do.

There's a clever rear seat remote control, which is a little detachable tablet to allow those who are being chauffered to faff around with various settings.

Our car had the $13,900 'Sensory Package', which adds a 1820-watt B&O 3D sound system with 23 speakers, electrically adjustable outer rear seats along with heating, cooling and massage function, and full leather.

The X7 xDrive40d is powered by a 3.0-litre, in-line six-cylinder turbo-diesel engine, that gets a boost in power - it pumps out 259kW of power and 720Nm of torque - 64kW/100Nm more than the 30d.

It now also comes with 48-volt mild hybrid tech, which uses an electric motor integrated in the eight-speed automatic transmission.

It drives all four wheels via BMW’s 'xDrive' all-wheel drive system and it is fitted with air suspension for a cushy ride. Towing capacity is rated at 3.5 tonnes braked or 750kg unbraked.

If you are keen on off-roading in the X7, it has a 221mm ground clearance, and a fording depth of 500mm, but maybe best to keep it on the tarmac.

Under that long bonnet is a 4.0-litre twin-turbo V8 pumping out 420kW and a diesel-like 800Nm of torque. 

That's a lot, even for this big bruiser. Obviously, being an Audi S-car, it has quattro all-wheel drive, which is fed by an eight-speed ZF automatic. Which is in everything now. Well, just about.

That huge torque figure is available between 2000rpm and 4500rpm while peak power arrives at 6000rpm. The 0-100km/h sprint is despatched in - gulp - 3.8 seconds.

As it's riding on the MLB platform, the mild hybrid system is a 48-volt set-up. A lithium-ion battery in the boot takes charge from the belt alternator/starter, which means the S8 can coast at higher speeds with the engine off and also cut out at 22km/h and under in traffic.

The system can also add up to 60Nm of torque in the right conditions for up to six seconds, and if it happened for me, I didn't notice it.

According to BMW, the official combined cycle fuel figure for the X7 40d is 8.0 litres per 100 kilometres.

Our fuel figure after nearly a week of mixed city, freeway and country driving was 9.0L/100km, which isn’t too far off the mark.

It has an 80 litre fuel tank and an approximate driving range of 1000km.

The 10.5L/100km official figure is, shall we say, optimistic. The launch drive was mostly highway so there's no real information to be gleaned from that, so we'll have to wait for real world fuel figures.

I'd say 12-13L/100km is achievable if you don't like having fun, in which case, the lesser A8 is probably for you.

Audi says the MHEV system saves 0.8L/100km with an early cut-out for the stop-start and the ability to coast on the highway for over half a minute at a time.

With a big plush SUV like this, you’d expect a comfortable ride. And for the most part, the X7 delivers that, while offering more than a bit of grunt, as well.

The X7’s height ensures a high driving position, and there’s plenty of glass for decent visibility. 

Propelling a 2.5-tonne SUV could be a struggle for a lesser engine, but the meaty diesel offers ample torque and the mild hybrid set-up helps to reduce initial turbo lag significantly - that means it is responsive from a standing start.

I wouldn't have thought a vehicle of this size and shape was capable of a 5.9-second 0-100km/h time, but here we are.

As a result of all that torque and power, overtaking is a breeze - providing there is enough room on the other side of the road for both cars to fit.

That size and heft have an impact on cornering and dynamics. You simply can’t carve through tight corners in this car, but with that said, it’s more entertaining than you’d think. 

Steering feel is weighted on the heavier side and it’s as sharp as it needs to be in a car like this. It would be weird if the steering was too pointy. 

Ride quality is top notch - as it should be - and while the massive optional 23-inch wheels and low profile tyres mean you’ll notice potholes and the like, it largely soaks up imperfections with ease.

That level of refinement extends to the hushed ride, too. The cabin is a quiet and serene place to spend time - but not quite to the same degree as a 7 Series. 

Parking in tight spots is a challenge, and manoeuvring in narrow streets could take a while, too. But you could tell that just by looking at the X7.

Driving any of the cars in this segment is a rare treat, whether it's the 'entry level' diesel or this top of the heap sports sedan. My day with the S8 was filled with the usual surprise and delight that only these tech-packed cars can deliver.

Heading out of the Sydney CBD in 'Comfort' mode, the car scans the road ahead and adjusts the active suspension accordingly. You already know it has active suspension because when you pull the door handle, the car lifts by 50mm to make it a bit easier to get in.

The suspension's party trick is flat-topped speed bumps - drive at one, brake a little and sense the way the body feels like it stays exactly where it is in the air but the suspension almost completely flattens the speed hump.

It's uncanny and almost unnatural, with just the tiniest change in altitude and no noise from the suspension.

It also manages the terrible narrow lanes of CBD thoroughfares with ease, the lane keep system letting you know if you're straying.

On to the motorway and you get a feel for its crushing performance. You won't hear much, though - the stereo's noise-cancelling system shuts out almost all tyre noise and consistent wind noise is largely banished, too.

I'm going to admit I gasped when I found some corners. Active suspension bodes well for the tricky stuff, as does the all-wheel steering. Both are exceptionally clever systems for making the car feel a lot smaller in town and in car parks but they're also really good if you want some fun.

But the way the rear-wheel steer adds agility to such a big car is hilarious and clever. While you can't quite chuck it around - and really, you're not buying an A8-sized car for that kind of nonsense - brisk progress is far from intimidating.

Now, obviously, a Ford Fiesta would drive away from the S8 in the really tight stuff but it would take some time to properly shake it. The colossal torque from the V8 hurls even this two-tonne-plus limo out of the corners in a most satisfactory manner.

It's surprisingly agile for a machine more than five metres long and two metres wide. If your passengers are corner enthusiasts, you'll all be having fun in near silence. It's oddly engaging to be moving at pace in such a hushed cabin.

The S8's considerable safety equipment list includes nine airbags, ABS, stability and traction controls, forward AEB (up to 250km/h), reverse cross-traffic alert, lane departure warning, various collision mitigation and protection systems, exit warning, lane keep assist, active cruise control and on, and on, and on.

The rear seat's centre airbag is terribly clever, popping up between passengers to stop you knocking heads. Another clever trick is the way the car detects a side impact is about to happen, boosting the height of the side about to cop it to try and get the sills to take more of the impact, rather than the door.

Given the relatively niche status of the A8, let alone the S8, there is no ANCAP crash test or safety rating. One imagines given the ton of safety gear a five star rating is all but assured. Even the US IIHS gave the A8 a miss.

After copping a bit of flack from motoring media and buyers, BMW finally increased its warranty terms last year from three years to an industry standard five-year, unlimited kilometre warranty on its vehicles, including the X7.

Rather than a set servicing schedule, BMW offers condition-based servicing which is when the vehicle’s computer alerts the owner that it requires a service. 

BMW doesn’t offer capped-price servicing, but does have a pre-paid 'Service Inclusive Package' with terms ranging from three years/40,000km to five years/80,000km and beyond. 

A five-year basic package for the X7 costs $2800, which is not too bad considering the positioning of this model.

Audi continues to fail to match Mercedes move to a five year warranty, sticking with three year/unlimited kilometre cover. BMW is still doing it too, so maybe Ingolstadt and Munich are playing chicken. 

You can get a five-year service plan for the S8, coming out at $3990 for the duration.