Compare 2018 BMW 6-Series vs 2018 Mercedes-Benz SL Class

2018 BMW 6-Series
2018 Mercedes-Benz SL Class
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640i Convertible
Style MPG City MPG Hwy Invoice MSRP
6 Series 640i Convertible 20 29 $81,130 $86,700
6 Series 640i Gran Coupe 20 29 $76,200 $81,400
6 Series 640i xDrive Convertible 19 28 $83,920 $89,700
6 Series 640i xDrive Gran Coupe 19 28 $78,990 $84,400
6 Series 640i xDrive Gran Turismo 20 28 $65,785 $70,200
6 Series 650i Convertible 17 25 $91,920 $98,300
6 Series 650i Gran Coupe 17 25 $86,990 $93,000
6 Series 650i xDrive Convertible 16 25 $94,710 $101,300
6 Series 650i xDrive Gran Coupe 16 25 $89,780 $96,000
6 Series ALPINA B6 xDrive Gran Coupe 16 25 $116,100 $124,300
M6 Convertible 14 20 $114,240 $122,300
M6 Gran Coupe 14 20 $111,915 $119,800
Select style
AMG SL 63 Roadster
Style MPG City MPG Hwy Invoice MSRP
SL AMG SL 63 Roadster 16 25 $142,151 $152,850
SL AMG SL 65 Roadster 13 22 $206,460 $222,000
SL SL 450 Roadster 20 28 $82,026 $88,200
SL SL 550 Roadster 17 25 $104,439 $112,300
Pricing
Invoice Price
$81,130
$142,151
Manufacturer Suggested Retail Price
$86,700
$152,850
Monthly Payment Estimate
$1445 / month
$2548 / month
The Car Connection's Take
TCC Rating
6.8
7.6
TCC’s Bottom Line
One of the ultimate grand-tourers, the BMW 6-Series stands ready to eat up miles, buyers' budgets, and premium unleaded. The 2018 Mercedes-Benz SL-Class represents the pinnacle of droptop grand touring cruisers. But what does that mean anymore?
TCC Likes
TCC Dislikes
Fuel Economy
City
20 mpg 16 mpg
Highway
29 mpg 25 mpg
Vehicle
EPA Classification
Subcompact Cars Two-Seaters
Interior Dimensions
Passenger Capacity
4 2
Front Leg Room (in)
42.1 42.9
Second Head Room (in)
36.5 -
Second Shoulder Room (in)
49.6 -
Front Head Room (in)
40.3 39.1
Passenger Volume (ft³)
89 50.5
Front Shoulder Room (in)
56.9 55.5
Second Leg Room (in)
30.5 -
Front Hip Room (in)
- 53.6
Exterior Dimensions
Track Width, Rear (in)
65.2 63.2
Wheelbase (in)
112.4 101.7
Width, Max w/o mirrors (in)
74.6 73.9
Track Width, Front (in)
63 63.1
Min Ground Clearance (in)
4.8 -
Length, Overall (in)
192.8 182.7
Height, Overall (in)
53.7 51.2
Cargo Area Dimensions
Trunk Volume (ft³)
10.6 8.5
Brakes
Rear Brake Rotor Diam x Thickness (in)
13.6 14.2
Brake Type
4-Wheel Disc 4-Wheel Disc
Rear Drum Diam x Width (in)
NA NA
Disc - Front (Yes or )
Yes Yes
Front Brake Rotor Diam x Thickness (in)
13.7 15.4
Drum - Rear (Yes or )
NA NA
Brake ABS System
4-Wheel 4-Wheel
Disc - Rear (Yes or )
Yes Yes
Fuel Tank
Fuel Tank Capacity, Approx (gal)
18.5 19.8
Steering
Turning Diameter - Curb to Curb (ft)
38.4 36.4
Steering Type
Rack-Pinion Rack-Pinion
Tires
Spare Tire Order Code
NA NA
Rear Tire Size
P245/45VR18 P285/30YR19
Rear Tire Order Code
NA R01
Front Tire Size
P245/45VR18 P255/35YR19
Spare Tire Size
NA NA
Front Tire Order Code
NA R01
Weight Information
Base Curb Weight (lbs)
4255 4068
Wheels
Front Wheel Material
Aluminum Aluminum
Spare Wheel Material
NA NA
Front Wheel Size (in)
18 X 8 19 X 9
Spare Wheel Size (in)
NA NA
Rear Wheel Material
Aluminum Aluminum
Rear Wheel Size (in)
18 X 8 19 X 10
Electrical
Maximum Alternator Capacity (amps)
210 -
Engine
Engine Type
Intercooled Turbo Premium Unleaded I-6 Twin Turbo Premium Unleaded V-8
Fuel System
Gasoline Direct Injection Gasoline Direct Injection
SAE Net Torque @ RPM
330 @ 1400 664 @ 2250
Engine Order Code
NA NA
Displacement
3.0 L/182 5.5 L/333
SAE Net Horsepower @ RPM
315 @ 5800 577 @ 5500
Mileage
EPA Fuel Economy Est - City (MPG)
20 16
Fuel Economy Est-Combined (MPG)
23 19
EPA Fuel Economy Est - Hwy (MPG)
29 25
Transmission
Reverse Ratio (:1)
3.29 3.42
Second Gear Ratio (:1)
3.14 2.86
Trans Order Code
2TB 427
Fourth Gear Ratio (:1)
1.67 1.37
Trans Description Cont.
Automatic w/OD Automatic w/OD
Eighth Gear Ratio (:1)
0.67 -
Sixth Gear Ratio (:1)
1.00 0.82
First Gear Ratio (:1)
4.71 4.38
Final Drive Axle Ratio (:1)
3.23 2.65
Third Gear Ratio (:1)
2.11 1.92
Trans Type
8 7
Seventh Gear Ratio (:1)
0.84 0.73
Drivetrain
Rear Wheel Drive Rear Wheel Drive
Fifth Gear Ratio (:1)
1.28 1.00
Trans Description Cont. Again
NA NA
Summary
Body Style
Convertible Roadster
Vehicle Name
BMW 6 Series Mercedes-Benz SL
Suspension
Suspension Type - Rear
Multi-Link Multi-Link
Suspension Type - Rear (Cont.)
Multi-Link Multi-Link
Suspension Type - Front
Double Wishbone Multi-Link
Suspension Type - Front (Cont.)
Double Wishbone Multi-Link
Emissions
Tons/yr of CO2 Emissions @ 15K mi/year
7.7 9.2

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