2018 Mercedes-Benz SL 550 Convertible

#26
in Midsize convertibles
2018 MODEL

$112,300

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Overview

Comfortable seating, luxurious interiors, and robust performance are benchmarks of SL 550 Roadster. In fact, the entire SL lineup of coupes is meant to give an awfully pleasing cruising experience without compromising the performance. The latest 2018 revamp of the Mercedes-Benz SL 550 Roadster offers enhanced everything plus a better handling.

The SL 550 Roadster packs a 4.7L Bi-Turbo V8 engine. Because of it, the ride is able to deliver a powerful performance backed by 449 hp of power. Moreover, the engine imparts 516 lb.-ft. of torque to the ride. The luxury sports coupe offers a 9-speed automatic transmission mode, not available in any other rival. Although the coupe delivers powerful performance, some class competitors outshine it.

Pricing for 2018 Mercedes-Benz SL 550 Roadster start from $112,300. In the segment, it competes with the likes of BMW M6 Cabriolet, Jaguar F-Type R Convertible and Porsche 911 GTS Cabriolet. All of them offer better acceleration and power than the SL 550 Roadster. Nonetheless, the luxury cabriolet overshadows its adversaries in terms of torque, combined fuel economy, and comfortable seating.

See detailed review »

Pros

NA

A powerful engine

Premium interiors and cabin

Fully comfortable seats

Cushioned seating

Impressive fuel economy

Cons

NA

Uninspiring infotainment system

A few options to go with

What's New?

Rearview camera is now a standard feature


Features

vehicle bio

base price

$112300

bodystyle

2dr Convertible

passenger capacity

2

drivetrain

RWD

engine type

displacement

285 cu. in.

horsepower

449 hp @ 5500 rpm

torque

516 lb.-ft. @ 1800 rpm

transmission

9-speed automatic

chassis

brake rotors (f/r)

12.6 in. ventilated disc brakes/14.2 in. ventilated disc brakes

dimensions

wheelbase

101.7 in.

length

182.3 in.

width

76.7 in.

height

51.2 in.

curb weight

3959 lbs.

ground clearance

3.7 in.

capacity

passenger volume

50.5 cu ft.

cargo volume

13.5 cu ft.

performance

zero to 60 mph

3.7 sec.

standing ¼-mile

11.8 sec.

braking (70-0 mph)

162 ft.

fuel economy

city/combined/highway

25/20/25 mpg

highway range

495 mi.

warranty

roadside assistance

No



Styles

 2018 Mercedes-Benz SL 550 Convertible in Magnetite Black Metallic color  2018 Mercedes-Benz SL 550 Convertible in designo Magno Selenite Gray color  2018 Mercedes-Benz SL 550 Convertible in Brilliant Blue Metallic color  2018 Mercedes-Benz SL 550 Convertible in designo Cardinal Red Metallic color  2018 Mercedes-Benz SL 550 Convertible in Black color
Magnetite Black Metallic

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

Engine

7.6

Fuel Economy

5.7

Interior

7.6

Exterior

6.6

6.9

OVERALL RATING

Variant Name

MSRP


 2018 Mercedes-Benz SL 550 Convertible SL 550

SL 550

Fuel: Premium unleaded (required), Transmission: Manual, Seats: 2

$112,300

Configurations
SL 550 2dr Convertible (4.7L 8cyl Turbo 9A)
Transmission: 9A MPG: (17/20/25)

Expert Review


carhp editor October 22, 2018

6.9

Overall Rating


 

7.6/10
Engine

 

5.7/10
Fuel Economy

 

7.6/10
Interior

 

6.6/10
Exterior

 
 
 
 

The SL 550 Roadster packs a 4.7L Bi-Turbo V8 engine. Because of it, the ride is able to deliver a powerful performance backed by 449 hp of power. Moreover, the engine imparts 516 lb.-ft. of torque to the ride. The luxury sports coupe offers a 9-speed automatic transmission mode, not available in any other rival. Although the coupe delivers powerful performance, some class competitors outshine it.

Features

19-inch wheels, an automated parking system and dual-zone automatic climate control are some major highlights of the SL 550 Roadster. Cruising is made interactive and enjoyable with a reliable and powerful navigation system. Moreover, the ride comes equipped with Mercedes’ Mbrace emergency communications for helping you out during undesirable scenarios. The luxury sports car also allows integration with Android Auto and Apple CarPlay.

Trim SL 550 Roadster
MSRP $112,300
Key Features
  • 19-inch wheels
  • Power trunklid with hands-free activation
  • Automated parking system
  • Airscarf neck-level heater
  • Ventilated seats with active side bolster and massage functions
  • Dual-zone automatic climate control
  • Power-adjustable steering wheel
  • Sun-reflecting leather upholstery
  • Power-adjustable heated seats
  • Navigation system, voice controls
  • Mercedes' Mbrace emergency communications
  • COMAND infotainment system
  • Apple CarPlay and Android Auto, 2-USB ports
  • 11-speaker Harman Kardon sound system
  • 6-CD changer and satellite and HD radio

Mercedes-Benz SL 550 Roadster features an 11-speaker Harman Kardon sound system and HD radio. In addition to being comfy and luxurious, the leather upholstery added to the coupe interiors also reflects sunlight. Also, the coupe features ventilated seats with active side bolsters and massage functions.

Engine

7.6/10

"The SL-Class has slightly synthetic handling but extremely capable. Midcorner bumps don't throw it off too badly. It's equal parts boulevardier and sports car, depending on your whims. Expect mega-power, surprising grip, powerful brakes and good manners."- edmunds

Engine and Transmission

Powered by a 449hp 4.7L Bi-Turbo V8 engine, the SL 550 Roadster delivers excellent performance. However, its engine power is lowest among the fraternity. The ride is in close league with Porsche 911 GTS Cabriolet in terms of power. The latter’s 3.0L Twin-turbocharged boxer 6 engine delivers a power of 450 hp. Jaguar F-Type R Convertible offers 550 hp of power, while BMW M6 Cabriolet comes with slightly higher 560 hp.

Models Mercedes SL 550 Roadster Porsche 911 GTS Cabriolet Jaguar F-Type R Convertible BMW M6 Cabriolet
MSRP $112,300 $133,300 $103,850 $122,300
Engine 4.7L Bi-Turbo V8 3.0L Twin-turbocharged boxer 6 5.0L V8 Supercharged 4.4L DOHC V8 32V TwinPower Turbo
Transmission 9-speed Automatic 7-speed Automatic 8-speed Automatic 7-Speed Automatic
Horsepower 449hp @ 5,250-5,500 rpm 450hp @ 6500 rpm 550hp @ 6500 rpm 560hp @ 6000 rpm
Torque 516 lb.-ft. @ 1800 rpm 405 lb.-ft. @ 2150-5000 rpm 502 ft-lbs. @ 3500 rpm 500 ft-lbs. @ 1500 rpm

2018 Mercedes-Benz SL 550 Roadster, however, offers the most torque, 516 lb.-ft. in its class. Jaguar F-Type R Convertible and BMW M6 Cabriolet are in close competition with 502 and 500 ft.-lb. of torque, respectively. Porsche 911 GTS Cabriolet has the least torque of 405 lb.-ft. in the segment. M6 Cabriolet and 911 GTS Cabriolet supports a 7-speed automatic transmission mode. On the other hand, F-Type R comes with an 8-speed auto transmission mode.

Acceleration

2018 Mercedes-Benz SL 550 Roadster flaunts to have an impressive 0-60 MPH acceleration time of 4.3 seconds. Nonetheless, this is the slowest among the fraternity. BMW M6 Cabriolet beats SL 550 Roadster in the same task by 0.3 seconds. Jaguar F-Type R Convertible takes 3.9 seconds to hit 60 MPH from nothing. The best 0-60 MPH acceleration time is boasted by the Porsche 911 GTS Cabriolet. It takes merely 3.6 seconds to shoot to 60 MPH.

Models Mercedes SL 550 Roadster Porsche 911 GTS Cabriolet jaguar F-Type R Convertible BMW M6 Cabriolet
0-60 MPH 4.3 sec 3.6 sec 3.9 sec 4.0 sec
Quarter mile 11.5 sec 12.2sec 11.7 sec 11.9 sec
Engine 4.7L 3.0L 5.0L 4.4L

Emission

(Tons/yr of CO2 Emissions @ 15K mi/year)

8.8 8.4 9.8 11.0

911 GTS Cabriolet traverses a quarter-mile in 12.2 seconds, slowest in the competition. The ride is bested by BMW M6 Cabriolet, which takes 11.9 seconds to do the same. However, this is even slower than that of 11.7 seconds taken by the Jaguar F-Type R Convertible. Amazingly, the best quarter-mile time is offered by none other than the SL 550 Roadster. The luxury sports coupe takes merely 11.5 seconds to do so.

Ride and Handling

To be straightforward, 2018 Mercedes-Benz SL 550 Roadster isn’t there to compete with sports-first, luxury-second coupes. The list includes the likes of Porsche 911 GTS Cabriolet. On the contrary, it is designed to ensure the passengers enjoy a comfy, solid and highly-safe ride. As such, handling and steering are something awesome with the luxury sports coupe.

The steering power is complemented by a strong braking system and made complete with a well-build handling mechanism. The desirable result is in front of us in the form of the 2018 Mercedes-Benz SL 550 Roadster. In short, you need not hold yourself from letting it loose on wide, curvy drives.

Braking

SL 550 Roadster’s front brake and rear brake measure 14.2-inch and 12.6-inch, respectively. The brakes are powerful and easy to take charge of. The rear brake of SL 550 Roadster is smallest among the league. Jaguar F-Type R Convertible and BMW M6 Cabriolet feature the most balanced braking systems.

Model Mercedes SL 550 Roadster Porsche 911 GTS Cabriolet Jaguar F-Type R Convertible BMW M6 Cabriolet
Brake Front (in.) 14.2 13.8 15 15.7
Brake Rear (in.) 12.6 13 14.8 15.6
Curb Weight (lbs.) 3959 3,396 3847 4515
60-0 MPH (ft.) 113 112 113 115

BMW M6 Cabriolet takes a distance of 115 feet for coming to a halt from 60MPH. 2018 Mercedes-Benz SL 550 Roadster accomplishes the same feat in 113 feet. This is similar to that offered by the Jaguar F-Type R Convertible coupe. The best among the league is offered by the Porsche 911 GTS Cabriolet. It takes 112 feet to do the same.

Fuel Economy

5.7/10

Fuel economy isn’t much of a concern in luxury sports segment. Anyhow, anybody would love to drive a luxury sports that offers better fuel economy than the contemporaries. 2018 Mercedes-Benz offers an impressive combined fuel economy of 20 mpg. The luxury sports coupe delivers 17 mpg in city conditions and 25 mpg on highways.

Model Mercedes SL 550 Roadster Porsche 911 GTS Cabriolet jaguar F-Type R Convertible BMW M6 Cabriolet
MPG (city) 17 18 15 14
MPG (highway) 25 26 23 20
MPG (combined) 20 21 18 16

BMW M6 Cabriolet offers a combined fuel economy of 16 mpg only. Jaguar F-Type R Convertible offers a better combined fuel economy of 18 mpg. Porsche 911 GTS Cabriolet bests SL 550 Roadster by 1 additional mile i.e. 21 mpg.

Interior

7.6/10

"The well-laid-out cabin offers a surprising amount of room as well as very easy entry and exit. The convertible top earns high marks for its quick, quiet and low-effort stowage. It does, however, compromise the cargo area."-edmunds

Seating and Comfort

Passenger capacity of the 2018 Mercedes-Benz SL 550 Roadster is 2, which is acceptable. Jaguar F-Type R Convertible also allows only 1 passenger to travel along with the one driving the coupe. However, BMW M6 Cabriolet and Porsche 911 GTS Cabriolet features passenger space for up to 4 persons.

Model Mercedes SL 550 Roadster Porsche 911 GTS Cabriolet jaguar F-Type R Convertible BMW M6 Cabriolet
Passenger capacity 2 4 2 4
Front (Head/Shoulder/Leg) (In.) 39.1/55.5/42.9 38.8/52.0/45.8 37.0/56.5/43 40.3/56.9/42.1
Second (Head/Shoulder/Leg) (In.) N/A 33.2/48.5/27.0 N/A 36.5/49.6/30.5

Front headroom, shoulder-room, and legroom available in the Mercedes SL 550 Roadster are 39.1, 55.5 and 42.9 inches, respectively. The headroom and legroom are above average, while the shoulder-room is fairly large.

Infotainment System

The intuitive infotainment system integrated to the SL 550 Roadster is complemented by a Harman/Kardon LOGIC7 sound system. Passengers enjoy immersive listening thanks to the Dolby Digital 5.1 surround sound technology. To make things hi-fi, the infotainment system comes with a COMAND, Cockpit Management, and Data, system. It allows the driver to effortlessly stay in control of most infotainment features and functions.

Interior Features

Ranging from featuring an upscale interior to the plenty of head and legroom spaces, the 2018 SL 550 Roadster is pleasing on the inside. And, it’s better than ever. The interiors of the latest 2018 Mercedes-Benz SL 550 Roadster comes with:

  • Comfortable seating with attractive interior work
  • Upscale and robust cabin
  • Modern digital features
  • Beautifully located infotainment system

Cargo Capacity

SL 550 Roadster features 8.5 cubic feet of cargo volume with rear seats up. Porsche 911 GTS Cabriolet offers merely 4.4 cubic feet of the same. Jaguar F-Type R Convertible features 7.0 cubic feet of the cargo space. The total cargo capacity of SL 550 Roadster is second only to BMW M6 Cabriolet. The coupe offers 10.6 cubic feet of the cargo volume with rear seats up.

Model Mercedes SL 550 Roadster Porsche 911 GTS Cabriolet Jaguar F-Type R Convertible BMW M6 Cabriolet
Cargo Volume with rear seats up (ft.3) 8.5 4.4 7.0 10.6

Exterior

6.6/10

"The new Mercedes-Bens SL gets a front-end restyle, drawing inspiration from its iconic lineage. It looks better. It’s a successful marriage of modern style and timeless long-hood/short-deck proportions."- Kelley Blue Book

Dimension and Weight

Length, width, and height of 2018 Mercedes-Benz SL 550 Roadster are 182.3, 82.6 and 51.2 inches, respectively. The width is the most in the competition. Ground clearance for the luxury sports coupe is 3.7 inches. This is the least in the competition. Most ground clearance is offered by the Porsche 911 GTS Cabriolet of 4.2 inches. BMW M6 Cabriolet also offers the same ground clearance.

Model Mercedes SL 550 Roadster Porsche 911 GTS Cabriolet Jaguar F-Type R Convertible BMW M6 Cabriolet
Curb weight (lbs.) 3,959 3,396 3847 4515
Length(in) 182.3 178.3 176.0 193.0
Width(in) 82.6 72.9 74.2 74.8
Height(in) 51.2 50.8 51.5 53.9
Ground clearance (in) 3.7 4.2 3.9 4.2
Wheelbase (in) 101.7 96.5 103.2 112.2
Track width (in) F/R 62.8/63 60.6 / 60.8 62.4/64.1 64.2/63.5

Wheelbase for the 2018 Mercedes-Benz SL 550 Roadster is 101.7 inches. This is more than that of the 96.5 inches offered by the Porsche 11 GTS Cabriolet. BMW M6 Cabriolet offers the maximum wheelbase of 112.2 inches among the competition. In terms of curb weight, SL 550 Roadster weighs a total of 3959 lbs. This is better than that of the 4515 lbs. of BMW M6 Cabriolet. However, it is bulkier than that of the F-Type R Convertible and 911 GTS Cabriolet.

Exterior Features

There aren’t any major changes to the exteriors of the SL 550 Roadster. Nonetheless, a plethora of minor refurbishes are there to excite devotees of the luxury sports cars. Some of the important exterior feats to the 2018 Mercedes-Benz SL 550 Roadster include:

  • Intrinsically-designed grille featuring glistening chrome “diamond-block” texture
  • Sport lower body styling around wheels
  • Well-proportioned, both as a sleek closed coupe and a classic open roadster
  • Transforms to open roadster from closed coupe and vice-versa in less than 20 seconds
  • Panoramic rooftop with heat-reflecting transparent panel
  • Deep front air dam features large mesh air intakes as well as a color-keyed splitter

Safety

In order to promise a robust performance and utmost comfort, the SL 550 Roadster comes with impressive safety and security feats. Some of the notable feats include, ABS and Driveline Traction Control, mbrace2 Emergency SOS, Collision Prevention Assist Plus Forward Collision and Dual Stage Drive and Passenger Front Airbags.

Moreover, the latest revamp of the Mercedes-Benz SL 550 Roadster comes with a back-up camera. There are a few safety sensors available too, including the Baby Smart Child seat Sensor and the Airbag Occupancy Sensor.

Safety Features

  • Electronic Stability Control (ESC)
  • ABS and Driveline Traction Control
  • Side Impact Beams
  • Dual Stage Driver and Passenger Seat-Mounted Side Airbags
  • mbrace2 Emergency SOS
  • Collision Prevention Assist Plus Forward Collision
  • Parking Pilot Automated Parking Sensors
  • Tire Specific Low Tire Pressure Warning
  • Dual Stage Driver and Passenger Front Airbags
  • Curtain 1st Row Airbags
  • Airbag Occupancy Sensor
  • Driver and Passenger Knee Airbag
  • Baby Smart Child seat Sensor
  • Outboard Front Lap and Shoulder Safety Belts -inc: Pretensioners
  • Back-Up Camera

Competition

Mercedes Benz SL 550 Roadster vs BMW M6 Cabriolet

The BMW M6 Cabriolet is another opportune luxury sports coupe to go for. Featuring a 4.4L DOHC V8 32V TwinPower Turbo engine under the hood, it sacrifices some comfort for power boost. Pricing options for the car starts from $122,300, exactly $10k more than that of recent revamp of the SL 550 Roadster. 560 hp of engine power is complemented by a 7-speed automatic transmission mode.

M6 Cabriolet is capable of hitting the 60 MPH mark in 4 seconds. This is 0.3 seconds faster than that of the SL 550 Roadster. However, the latest Roadster covers a quarter-mile 0.4 seconds earlier than that of the M6. Unfortunately, BMW M6 Cabriolet has the most CO2 emission value of 11.0 in the segment.

Mercedes Benz SL 550 Roadster vs Jaguar F-Type R Convertible

The bid for Jaguar F-Type R Convertible starts from $103, 850. It is one of the least expensive car in the segment. In order to deliver a remarkable 550 hp of power and 502 lb.-ft. of torque, the luxury sports coupe relies on a 5.0L V8 Supercharged engine. It offers an 8-speed automatic transmission mode along 103.2 inches of wheelbase.

Basically, the Jaguar F-Type R Convertible trade-offs performance for luxury and features. It has additional 0.2-inch ground clearance than that of the SL 550 Roadster as well as better curb weight. Moreover, it has a reasonable combined fuel economy of 18 mpg. However, the latest revamp of SL Roadster has a better combined fuel economy of 20 mpg.

Mercedes Benz SL 550 Roadster vs Porsche 911 GTS Cabriolet

Porsche 911 GTS Cabriolet is the sleekest, fastest and nimblest ride in the sports luxury cars segment. Moreover, it is also the one with the heftiest price-tag of $133,300. The bid for 911 GTS Cabriolet starts $10k and $20k ahead than that of the BMW M6 Cabriolet and the SL 550 Roadster, respectively. It packs a 3.0L Twin-turbocharged boxer 6 engine along with a 7-speed automatic transmission mode.

911 GTS Cabriolet has the best 0-60 MPH time of 3.6 seconds in the segment. It also has the best combined fuel economy of 21 mpg, which is, in fact, impressive for a luxury sports coupe. The CO2 emission value of 8.4 for the car is also the least in the league. The cargo space is however much lesser than that of any other coupe in the competition, including the SL 550 Roadster.

Final Verdict

Ventilated front seats, Airscarf and hands-free power trunk lid are some of the major attractions of the SL 550 Roadster. Moreover, there are a variety of standard features to enjoy with the luxury sports coupe. Though it doesn’t has the most high-end performance at its disposal, it surely excels in the luxury and comfort sections.

Though there are way much more options with 911 GTS Cabriolet, SL 550 Roadster makes any ride comfy and convertible. Converting the SL 550 Roadster from closed coupe to open Roadster is nimble. However, if having a passenger capacity of 2 is an issue, then other coupes like the BMW M6 Cabriolet and 911 GTS Cabriolet are better options.

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