2018 BMW 6 Series Convertible

2018 MODEL
$86,700 - $101,300 See Inventory Prices

7.7

Overall Rating

Detailed Review

Ever since the time the BMW 6 series returned back from its sabbatical about a decade ago, the 640i convertible has enjoyed a top position in the market and at the price point there aren't many others competing with it. The direct competitors, the Porsche drop top 911 Carrera and the Mercedes-Benz S-class convertible are significantly expensive.

See detailed review »

Pros

Lovely interiors

Fantastic Powertrain

Strategic pricing

Fuel economy

Cons

Harsh ride quality

Unresponsive Steering

Low Headroom

What's New?

2018 BMW 6-Series convertible doesn't offer anything extraordinary from the previous versions


Features

vehicle bio

base price

$86700

bodystyle

4dr Hatchback

passenger capacity

5

top speed

130 mph

drivetrain

AWD

engine type

displacement

183

horsepower

335 hp @ 5500 rpm

torque

330 lb.-ft. @ 1400 rpm

transmission

8-speed automatic

chassis

brake rotors (f/r)

11.8 in./12.3

dimensions

wheelbase

120.9 in.

length

200.9 in.

width

74.9 in.

height

60.6 in.

curb weight

4409 lbs.

ground clearance

5.4 in.

capacity

passenger volume

89 cu ft.

cargo volume

11 cu ft.

payload capacity

772 lbs.

performance

zero to 60 mph

5.3 sec.

standing ¼-mile

14 sec.

fuel economy

city/combined/highway

20/23/28 mpg

ev range

370 mi.

highway range

504 mi.

warranty

basic warranty

4 years/50000 miles

drivetrain warranty

4 years/50000 miles

corrosion warranty

12 years/unlimited

roadside assistance

4 yr./ unlimited


Pictures & Videos


Styles

 2018 BMW 6 Series Convertible in Alpine White color  2018 BMW 6 Series Convertible in Carbon Black Metallic color  2018 BMW 6 Series Convertible in Glacier Silver Metallic color  2018 BMW 6 Series Convertible in Jet Black color  2018 BMW 6 Series Convertible in Ruby Black Metallic color
Alpine White

Vehicle images are guides only and may not reflect the model's exact specifications/features– exact specifications/features should be confirmed with the seller.

Ratings

Features

7.6

Engine

7.8

Fuel Economy

7.1

Interior

7.6

Exterior

7.8

7.7

OVERALL RATING

Trims and Configurations

MSRP


 2018 BMW 6 Series Convertible 640i

640i

power
315 hp @ 5800 rpm
fuel
Premium unleaded (required)
mpg
23 combined

$86,700


Style Prices MPG Engine Transmission Drivetrain Seats Colors
640i 2dr Convertible (3.0L 6cyl Turbo 8A) Starting at $86,700 MSRP (20/23/29) 315 hp @ 5800 rpm, 3 L, I6, premium unleaded (required)
See Full Specs
8-speed automatic rear wheel drive 4

 2018 BMW 6 Series Convertible 640i xDrive

640i xDrive

power
315 hp @ 5800 rpm
fuel
Premium unleaded (required)
mpg
22 combined

$89,700


Style Prices MPG Engine Transmission Drivetrain Seats Colors
640i xDrive 2dr Convertible AWD (3.0L 6cyl Turbo 8A) Starting at $89,700 MSRP (19/22/28) 315 hp @ 5800 rpm, 3 L, I6, premium unleaded (required)
See Full Specs
8-speed automatic all wheel drive 4

 2018 BMW 6 Series Convertible 650i

650i

power
445 hp @ 5500 rpm
fuel
Premium unleaded (required)
mpg
20 combined

$98,300


Style Prices MPG Engine Transmission Drivetrain Seats Colors
650i 2dr Convertible (4.4L 8cyl Turbo 8A) Starting at $98,300 MSRP (17/20/25) 445 hp @ 5500 rpm, 4.4 L, V8, premium unleaded (required)
See Full Specs
8-speed automatic rear wheel drive 4

 2018 BMW 6 Series Convertible 650i xDrive

650i xDrive

power
445 hp @ 5500 rpm
fuel
Premium unleaded (required)
mpg
19 combined

$101,300


Style Prices MPG Engine Transmission Drivetrain Seats Colors
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A) Starting at $101,300 MSRP (16/19/25) 445 hp @ 5500 rpm, 4.4 L, V8, premium unleaded (required)
See Full Specs
8-speed automatic all wheel drive 4

Top BMW Cars

2017 BMW ALPINA B7
9.0/10

Engine: 600 hp @ 5750 rpm, 4.4 L V8

MPG: 18 combined

2017 BMW 6 Series
9.1/10

Engine: 315 hp @ 5800 rpm, 3 L I6

MPG: 23 combined

2017 BMW 4 Series Gran Coupe
8.8/10

Engine: 248 hp @ 5200 rpm, 2 L I4

MPG: 27 combined

2019 BMW 5 Series
8.9/10

Engine: 248 hp @ 5200 rpm, 2 L I-4

MPG: 27 combined

2018 BMW ALPINA B7
8.7/10

Engine: 600 hp @ 5750 rpm, 4.4 L V8

MPG: 19 combined

2017 BMW 7 Series plug-in hybrid Sedan
9.0/10

Engine: 322 hp @ 5000 rpm, 2 L I4

MPG: 27 combined

2017 BMW M760i
9.0/10

Engine: 601 hp @ 5500 rpm, 6.6 L V12

MPG: 16 combined

2019 BMW 7 Series
8.7/10

Engine: 320 hp @ 5500 rpm, 3 L I-6

MPG: 24 combined


Expert Review


CARHP Editorial September 21, 2018

7.7

Overall Rating


7.6/10
Features

 

7.8/10
Engine

 

7.1/10
Fuel Economy

 

7.6/10
Interior

 

7.8/10
Exterior

 
 
 
 

Even with a price of around $90,000, the BMW 6 series gives it's much more expensive counterparts a run for their money in all the major department. Powered with a 3.0L I6 twin-turbocharged engine, it generates about 315 hp at 5800 rpm and 330 lb-ft of torque at 1400 rpm, figures which easily match its rivals. However, the pickup of this machine and harsh riding quality is something where it lags behind.

2018 BMW 6 Series Convertible Features

7.6/10

The BMW 640i Convertible is available in two versions: the 640i Convertible and the 650i Convertible. The front-engine, rear-wheel-drive, 4-passenger, 2-door convertible is powered by a 3.0L I6 twin turbo charged engine, with 8 speed automatic transmission as standard.

Trim 640i 650i
MSRP $86,700 $98,300
Key Features Automatic w/Driver Control Ride Control Adaptive Suspension 105-Amp/Hr Maintenance-Free Battery w/Run Down Protection
  Electric Power-Assist Speed-Sensing Steering Regenerative 210 Amp Alternator
  Cell Phone Pre-Wiring 600w Premium Amplifier
  Wheels w/Machined w/Painted Accents Accents Aluminum Wheels w/Machined w/Painted Accents Accents
  Power Convertible Top w/Lining, Glass Rear Window, Automatic Roll-Over Protection and Manual Wind BlockerEngine Auto Stop-Start Feature Gas-Pressurized Shock Absorbers
  Audio Theft Deterrent Radio: AM/FM Stereo CD/MP3 Player
  Radio: AM/FM Stereo CD/MP3 Player Chrome Side Windows Trim
  Hi-Fi Sound System Window Grid Diversity Antenna
  SiriusXM Satellite Radio w/1 Year All Access Enhanced USB & Bluetooth

Once the version has been selected, the buyer can choose between the two trims, one which is significantly expensive than the other.

We Recommend

Between the two, the 650i is the obvious choice. Not just you get a bigger engine but also a variety of features which makes the 6 series a luxury grand tourer. You get extra seat adjustability, All-wheel-drive, and better sound system. 

2018 BMW 6 Series Convertible Engine

7.8/10

The 2018 BMW 6 Series prioritizes comfort over sporty handling. Nevertheless, most drivers will enjoy the driving experience. - Edmunds

Engine and Transmission

The BMW 640i convertible is powered by a 3.0L I6 turbocharged Engine at produces 315hp and 330lb-ft, which provides rear wheel drive with 8-speed automatic transmission as standard.

Models 640i convertible Porsche 911 carrera cabriolet Mercedes Benz SL 450
MSRP $86,700 $103,400 $88,200
Engine 3.0L l6 3.0L l6 3.0L l6
Transmission 8-speed automatic 7-speed manual 9-speed automatic
Horsepower 315 hp @ 5800 rpm 370 hp @ 6500 rpm 362 hp @ 5500 rpm
Torque 330 lb-ft @ 1400 rpm 331 lb-ft @ 1700 rpm 369 lb-ft @ 2000 rpm

All the three, the BMW convertible, the 911 Carrera and the SL 450 are powered by the same 3.0L I6 engine which produces similar figures of torque and horsepower as well with the 640i being the cheapest and followed by the 911 Carrera and the SL 450.

Acceleration

The 8-speed automatic transmission takes a beating here as the 640i is the slowest of the blocks in the bracket of 0-60MPH. However, the acceleration is smooth and gives a tough fight to its competitors in the other departments.

Models 640i convertible Porsche 911 carrera cabriolet Mercedes Benz SL 450
0-60 MPH 5.5 4.6 4.9
Quarter mile 14.0 N/A 13.2
Engine 3.0 L 3.0 L 3.0 L
Emission (Tons/yr of CO2 Emissions @ 15K mi/year) 7.7 7.7 7.6

In this particular scenario, the SL 450 is the one which is a direct rival to the 640i convertible as it beats the BMW in the 0-60mph parameter. However, it is the BMW which wins in the Quarter mile.

The Porsche 911 Carrera was way ahead of the other two in the 0-60mph department, but came level in the other parameter.

Handling and Steering

If there is one parameter where the BMW scores over its rivals, it is the drive quality, and the Convertible didn't disappoint. The steering is a bit lackluster, but it is not touch much a worry.

As it being a rear wheel drive, the BMW is agile along the corners and responds well with the all season tires.

Braking

The BMW 640i convertible has the brakes which matches its acceleration. Despite being one with the heaviest car with a curb weight of 4,255 lbs, the brakes results are pretty decent.

Model 640i convertible Porsche 911 carrera cabriolet Mercedes Benz SL 450
Brake Front (in.) 13.7 13.0 14.2
Brake Rear (in.) 13.6 13.0 12.6
Curb Weight (lbs.) 4,255 3,307 3,826
60-0 MPH (ft.) N/A N/A N/A

The Porsche 911 being the lightest, it gives the best braking results amongst the three, closely followed by the Mercedes SL 450. The good part is that the rear and the front brakes give comparable value. However, considering the BMW being the cheapest, these are great figures.

2018 BMW 6 Series Convertible Fuel Economy

7.1/10

Being the heaviest amongst the three, it is naturally expected for the BMW 640i convertible to give the worst figures under this parameter and with a city mpg of 20 and highway mpg of 23, it does pretty well.

Model 640i convertible Porsche 911 carrera cabriolet Mercedes Benz SL 450
MPG (city) 20 20 20
MPG (highway) 29 29 28
MPG (combined) 23 23 23

However, the lightest 911 and the SL 450 follow closely behind, with somewhat equivalent figures of 20 mpg in the city and 29 and 28 mpg on the highway respectively.

2018 BMW 6 Series Convertible Interior

7.6/10

With premium materials everywhere, exquisite fit and finish, wood or carbon-fiber accents, a high-end audio system and supremely comfortable driver's seat, BMW’s 2018 6 Series leaves a lasting impression. - KBB

While the previous 640i had decent interior design, the new 640i has one of the best cabins in this range. The classic BMW analog and gauges gives it a premium feel. And with a touch screen infointment system, it makes the cabin experience, one with the highest quality.

Seating and Comfort

The BMW 640i is a two row cruiser which accommodates 4 people. It provides heated and cooled seating as well. The passenger rear seats are also electrically powered. The driver's seat is a bit hard but that shouldn't be much of an issue.

Model 640i convertible Porsche 911 carrera cabriolet Mercedes Benz SL 450
Passenger capacity 4 4 2
Front (Head/Shoulder/Leg) (In.) 40.3/56.9/42.1 N/A 39.1/55.5/42.9
Second (Head/Shoulder/Leg) (In.) 36.5/49.6/30.5 N/A N/A

The seats are electronically powered providing ample support to the driver. They are made of premium synthetic leather upholstery. Add to that leather wrapped steering wheel that can be adjusted to the preference and provides all wheel steering drive.

Interior Features

  • Cruise Control
  • Vehicle Anti-Theft System
  • Fog Lamps
  • Keyless Start
  • Steering Wheel Controls
  • Driver Vanity Mirror
  • Power steering

Infotainment System

The BMW 6-series infotainment system is easy to use, once you clear the first curve. It provides a premium sound system and a smart integration device. Add to that a WiFi hotspot, and it provides a great package.

  • AM/FM Stereo
  • Auxiliary Audio Input
  • MP3 Player
  • Satellite Radio
  • Smart Device Integration

Cargo Volume

The Convertible has a spacious trunk. There is no load lip to lift up the baggages. The storage spaces are excellent with a 12V socket as well. The rear seats are foldable leading to extra room.

Model 640i convertible Porsche 911 carrera cabriolet Mercedes Benz SL 450
Cargo Volume with 2nd row up (ft.3) 11.0 5.6 13.5

The Mercedes SL 450 is a direct competitor in this parameter. With a volume of 2.5 ft3 more than that of the BMW, it is clear winner. However, the Porsche lags far behind.

2018 BMW 6 Series Convertible Exterior

7.8/10

The recently redesigned nose on the 2018 BMW 6 Series is subtly effective, with the number of vertical bars in each "kidney" now nine instead of 10. The rear end looks menacing when viewed head-on, which is just as it should be. - KBB

This BMW cruiser has had a minor facelift from its 2016 version. It has a sharp nose and a tail end which looks smooth and luxurious. It now has one less vertical bar on the grill (now nine) .This is done along with tweaks to the fog lamps and the lower air intake. The Grand coupe adds up to 4.5 inches of length which facilitates its two rear doors. Its arch line roof gives it a sporting look with not so decent head room at the rear. With a ground clearance of 4.8 inches, it does provide adequate room to drive over the off-roading track as well.

Dimension and Weight

As mentioned, the new facelift version makes the 640i look more stylish and supreme than its previous versions. Add to that, it is one of the heaviest cruisers available in the market.

Model 640i convertible Porsche 911 carrera cabriolet Mercedes Benz SL 450
Curb weight (lbs.) 4,255 3,307 3,826
Length(in) 192.8 177.1 182.3
Width(in) 74.6 71.2 82.6
Height(in) 53.7 50.7 51.2
Ground clearance (in) 4.8 N/A 3.7
Wheelbase (in) 112.4 96.5 101.7
Track width (in) F/R 63.0/65.2 60.7/59.8 62.8/63.0

The BMW is about 10 inches longer than the Mercedes. The highest ground clearance shows it's off road nature. Although not as wide as the Mercedes, it has no impact on the passenger seating capacity.

Exterior Features

Some of the exterior features include:

  • Convertible Soft top
  • Rear Defrost
  • LED Headlights
  • 18-inches Alloy wheels
  • Power adjusted side mirrors

2018 BMW 6 Series Convertible Safety

The IIHS and the NHTSA have not yet rated the BME 640i Convertible.

Safety Features

The various safety features in the BMW 640i Convertible are:

  • DSC III Electronic Stability Control (ESC)
  • ABS And Driveline Traction Control
  • Dual Stage Driver And Passenger Seat-Mounted Side Airbags
  • First Aid Kit
  • Traction Control
  • Electronic stability control

2018 BMW 6 Series Convertible Competition

Porsche 911 Carrera vs BMW 6-Series

The BMW has far more advantages than the Porsche 911 Carrera. Both the cars have the same engine capacity, it is however the automatic version of the BMW which pips the Porsche here because of its ease to drive. The BMW also has a far more spacious trunk than the Porsche with a capacity of 11.o ft3 to that of 5.6 ft3 of the Porsche.

The BMW is also a taller, longer and wider car than the Porsche with a slightly better fuel economy than the latter. Thus, the BMW 640i convertible is a clear winner in this comparison.

Mercedes-Benz SL 450 vs BMW 6-Series 

The fight between the BMW and the Mercedes-Benz goes right down to the wire. Both generate almost equal figures in the engine capacity and the fuel economy. The cargo capacity is also almost equal.

However, the BMW is a longer car than the SL 450 and can house 4 passengers as that of 2 in the Mercedes-Benz, Thus emerging as a clear winner.

2018 BMW 6 Series Convertible Final Verdict

The 2018 BMW 640i may be a cheaper option than the Mercedes-Benz and the Porsche, It is nothing short of a true BMW experience. It gives the sporty feel, is luxurious from the inside and has a peppy drive quality to it.

However, all is not great with this car. The 0-60mph pickup is much less than the Porsche and the Mercedes-Benz. It is heavier than the other two.

But this can be covered by its better fuel economy and the luxurious experience. All in all, if you have the money, the Porsche 911 Carrera is a much better bet, however if someone is looking for a cheaper option, there is no parameter where the BMW 640i convertible lag too far behind.