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BMW6-series convertible (2011-2018)

Used only
Large
Petrol/Diesel/Mild hybrid

£9,615Typical price

Test score

where to buy or sell

The version of this car that we've reviewed might not be available to buy through all listed retailer links. For more options, see our guides on where to buy a car and how to sell a car.

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The first BMW 6 Series was a controversial design, but the second-generation 6 Series Convertible, launched in 2011, aims to appeal to a wider audience with its sleeker, subtler styling. Does it succeed? Read more in our full review.

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What's included?

What is it?
What's it great at?
What's it like to drive?
How reliable are BMW's cars?
How comfortable and spacious is it?
How economical is it to run?
How safe is it?
Is there anything I should look out for?
Should I buy it?

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KEY TEST RESULTS
Comfort and practicality
Brand reliability 0-4 years

Nov 2023Last checked by Which?
Mar 2011First reviewed by Which?
Mar 2011Released

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

How we test cars

6 Jun 2025

Ease of driving

Overall
Visibility
Smoothness of power delivery
Driving stability
Cabin layout

How we test ease of driving

To find out how easy a car is to drive, we assess cars across a number of areas from visibility and handling to the layout of the cabin and how smoothly the engine delivers its power.

Performance

Overall
In-gear acceleration
Brakes

How we test performance

We test braking distances and whether the effectiveness of the brakes fade with repeat use. Performance is based on in-gear acceleration.

Comfort and practicality

Overall
Entry and exit
Seat comfort
Ride quality
Quietness
Seat space
Boot space (large cars, SUVs and MPVs)

How we test comfort and practicality

Comfort and practicality includes how easy it is, or not, to get in and out of the car and the maximum height of occupants. We also measure road, wind and engine noise and assess how well the car deals with bumps from large potholes to jittery surfaces like cobble stones.

Safety kit

How we test safety kit

We factor in the safety equipment that’s factory-fitted or optional, along with how well the car protects its occupants and pedestrians in the event of an accident. We also test how easy it is to fit a variety of child car seats.

Brand reliability 0-4 years

Overall
Electric car reliability
Plug-in hybrid reliability
Petrol reliability
Diesel reliability

How we test brand reliability 0-4 years

Our reliability ratings are based on the feedback from tens of thousands of UK motorists, as collected in our annual Which? car survey. We divide all reliability feedback into three age groups: cars aged up to four years, five to nine years, and 10 to 15 years.

Brand reliability 5-9 years

Overall
Full hybrid reliability
Plug-in hybrid reliability
Diesel reliability

Brand reliability 10-15 years

Overall
Petrol reliability
Diesel reliability

General
Class	Large
Luxury	Yes
Convertible	Yes
Availability	Used only
Used price	£9,615 - £21,953
Fuel type	Petrol/Diesel/Mild hybrid
Tested fuel efficiency	30.7mpg
Length	4,894mm
Width (excluding wing mirrors)	1,894mm
Width (including wing mirrors)	2,080mm
Height	1,365mm
Driver max height
Second-row passenger max height
Boot space with seats up
Number of seats	4
Folding rear seats	No
Isofix attachments	Yes
Turning circle	11.7 m
On sale date	01 March 2011
Lowest pence-per-mile cost	£19.85

Latest tested engine
Engine and trim name	640i Cabriolet Automatic
Fuel type	Petrol
Capacity and power	3-litre (320hp)
Transmission	8-speed automatic
Driven wheels	Rear-wheel-drive (RWD)
Fuel tank capacity	70 litres
Tested fuel economy: Combined (mpg)
Cost per mile	19.85p per mile
Cost of filling tank	£94
Monthly fuel cost
Annual fuel cost
Engine test date	08 March 2011
Test programme	2001-2012

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BMW6-series convertible (2011-2018)

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pros

cons

What's included?

How we test cars

Ease of driving

Performance

Comfort and practicality

Safety kit

Brand reliability 0-4 years

Brand reliability 5-9 years

Brand reliability 10-15 years

How this product's score compares with other new and used cars we've tested

Suggested Alternatives

BMW

BMW

Audi

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BMW6-series convertible (2011-2018)

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What's included?

Test results

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Suggested Alternatives

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BMW

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