BMW 6 Series Convertible 640d M Sport 2dr Review

For The diesel engine gives effortlessly strong and smooth performance, and keeps running costs sensible.

Against Doesn't quite have the same satisfying growl as the petrols, although it sounds pretty good in its own right.

What Car? says

4 out of 5 stars

With its mix of stonking performance and reasonable running costs, the diesel is our pick of the range. We'd stick with SE trim, though.

What Car? readers say

4

Key facts

0–60mph: 5.6 secs
Top speed: 155 mph
Average mpg: 49.6
Tank range: 764 miles

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Features

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Size

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View the whole BMW 6 Series Convertible range

The full BMW 6 Series review

Performance
5 out of 5 stars
Brutal acceleration is never far away
Ride & Handling
4 out of 5 stars
In its element when you’re cruising
Refinement
4 out of 5 stars
Quiet enough for long-distance jaunts
Buying & Owning
4 out of 5 stars
Not cheap on either count
Quality & Reliability
4 out of 5 stars
A properly luxurious feel
Safety & Security
4 out of 5 stars
Most of what you’d expect
Behind The Wheel
5 out of 5 stars
Comfortable and orderly
Space & Practicality
3 out of 5 stars
Not quite a genuine four-seater
Equipment
4 out of 5 stars
Enough to be getting on with

Buyer's notes

Target Price team says:

You have two trims to choose from. We recommend SE, because it comes with all the luxury toys you need. MSport trim adds plenty to the price, but only cosmetic revisions to the car. On both, standard kit also includes Drive Dynamic Control, which lets you choose between four driving modes ranging from Comfort to Sport+, and tailors the steering, gearbox and throttle accordingly.

You can also add options to personalise your car. Adaptive Drive adjusts the suspension according to your selected mode, and Integral Active Steering turns all four wheels for sharper responses. Both are pricey, though.

You choose between three engines. The petrols include a 3.0-litre turbo known as the 640i, and a 4.4-litre twin-turbocharged V8 badged 650i, both driven through an eight-speed automatic gearbox. Both are hugely quick, but so is the 640d, which has a 3.0-litre turbodiesel. It also has lower running costs and a superior touring range, and that’s why it’s our favourite.