Skip advert
Advertisement

BMW 640d Gran Coupe

We hit the road in the twin-turbo version of the 6 Series Gran Coupe to deliver our verdict

Find your BMW 6 Series
Compare deals from trusted partners on this car and previous models.
Or are you looking to sell your car?
Value my car
Fast, no-nonsense car selling
Value my car

The 6 Series Gran Coupe is a beautiful thing – the best- looking BMW for some time and the company’s next best car after the new 3 Series. It’s not cheap, though: the price tag puts it directly up against the Porsche Panamera. But in 640d form, this stunning BMW makes a great case for itself thanks to incredible performance, brilliant fuel economy and great comfort.

Advertisement - Article continues below

BMW bills the 6 Series Gran Coupe as a GT car with some rear doors, rather than a saloon with a coupe body like the Audi A7 and Mercedes CLS. So it’s fitting we were able to test the grand tourer capabilities of a UK version of the car on an extended test drive of more than 700 miles.

Our route took in some demanding twisty mountain passes in France, Germany’s billiard table-smooth derestricted autobahns and the lumpy, battered tarmac of the UK.

And to spare you the suspense: the 6 Series Gran Coupe tackled each with aplomb. But more about that later.

First we need talk about the idea behind this car. BMW used the 6 Series as a starting point, rather than the lesser 5 Series, to make it more of a direct rival to the Porsche Panamera than the A7 or CLS.

Skip advert
Advertisement
Skip advert
Advertisement - Article continues below

Used - available now

Tiguan

2026 Volkswagen

Tiguan

14,135 milesAutomaticPetrol1.5L

Cash £37,599
View Tiguan
Ariya

2024 Nissan

Ariya

25,754 milesAutomaticElectric

Cash £26,700
View Ariya
Qashqai

2022 Nissan

Qashqai

19,439 milesManualPetrol1.3L

Cash £15,699
View Qashqai
Tucson

2023 Hyundai

Tucson

34,260 milesAutomaticPetrol1.6L

Cash £22,199
View Tucson

If this doesn’t convince you, then maybe the £61,000 starting price will. Thankfully, you can appreciate where the £10,000-plus premium over an equivalent Mercedes and Audi has been spent, because inside the Gran Coupe offers sufficient luxury to rival that of the big Porsche.

And while rear space isn’t as generous as in the Panamera, the fact the Gran Coupe is 113mm longer than the normal 6 Series means there’s still sufficient head and legroom for adults.

Advertisement - Article continues below

In fact, BMW bills the car as a 4+1-seater. You can just about fit a small person in the middle of the back seats, although they have to sit with their legs straddling the transmission tunnel. We found the only real benefit of the set-up is this: because there’s no central divider, you can lie down in the back for a power nap – handy when you’re crossing a continent.

Our test car was the 640d, which will account for 80 per cent of sales. It’s easy to see why. The engine is simply epic: incredibly efficient, surprisingly tuneful and hugely powerful. The car does 0-62mph in 5.4 seconds, which makes a Panamera diesel seem lethargic and even leaves the V8 petrol Porsche trailing.

Skip advert
Advertisement
Skip advert
Advertisement - Article continues below

Yet the BMW’s twin-turbo 3.0-litre diesel has the CO2 emissions of a small family hatchback and will return 

almost 50mpg. On our test, the trip computer showed an average 35mpg... but we did take the car to the limit on the autobahn.

And as you sit with the throttle buried in the carpet and the diesel chomping at the bit of its 155mph speed limiter, you appreciate what a stable, quiet and smooth long-distance cruiser this car is.

It’s also at home on a twisty mountain pass, where the precise steering, impressive grip and quick-changing eight-speed automatic gearbox make for fun as well as swift progress. There is one issue, though.

For the 6 Gran Coupe to perform as well as it can, you need the £3,400 Adaptive Drive package. Considering the high starting price, this should be standard. It not only keeps the car completely flat through corners, but also allows you to alter the stiffness of the suspension between various settings, with Comfort+ the most valuable mode for UK driving as it gives the Gran Coupe the ability to glide over even the worst bumps.

And so after more than 700 miles and 12 hours at the wheel, we arrived in London feeling fresh. We were glad to climb out of the driver’s seat only to appreciate again arguably the Gran Coupe’s best feature: its stunning styling.

Skip advert
Advertisement

New & used car deals

Omoda 5

Omoda 5

RRP £23,990Avg. savings £1,481 off RRP*
MG MG4

MG MG4

RRP £27,005Avg. savings £9,362 off RRP*Used from £10,295
Volkswagen Polo

Volkswagen Polo

RRP £15,255Avg. savings £1,912 off RRP*Used from £7,299
Nissan Qashqai

Nissan Qashqai

RRP £27,415Avg. savings £6,056 off RRP*Used from £10,399
* Average savings are calculated daily based on the best dealer prices on Auto Express vs manufacturer RRP
Skip advert
Advertisement

Most Popular

This is it! New Volvo EX60 leaked days before reveal
New Volvo EX60 leaked - front

This is it! New Volvo EX60 leaked days before reveal

Volvo’s new midsize electric SUV has been leaked ahead of its official reveal on Jan 21st
News
19 Jan 2026
Car Deal of the Day: Comfy Citroen C5 Aircross for a cool £188 a month
Citroen C5 Aircross - full front

Car Deal of the Day: Comfy Citroen C5 Aircross for a cool £188 a month

It may be brand new, but the Citroen C5 Aircross is currently the cheapest mid-sized family SUV on our marketplace. It’s our Deal of the Day for 20 J…
News
20 Jan 2026
New Hyundai Ioniq 3 to take the electric hatchback fight to the VW ID.3
Hyundai Ioniq 3 teaser

New Hyundai Ioniq 3 to take the electric hatchback fight to the VW ID.3

Hyundai previewed its forthcoming electric hatchback with the striking Concept Three at the 2025 Munich Motor Show
News
20 Jan 2026