Cadillac CT6 vs. Mercedes-Benz S-Class
iSeeCars' unbiased and data-driven comparison of the Cadillac CT6 and Mercedes-Benz S-Class contrasts the two cars across a broad spectrum of vehicle specifications to determine which car is better. In addition to comparing pricing and specs, iSeeCars uses all the ratings, rankings, and insights from its comprehensive analyses of each vehicle model, including calculations of reliability, safety, depreciation, value retention, and the vehicle's projected lifetime recalls (based on analyzing over 25 billion data points). This in-depth evaluation is used to identify which vehicle represents a better overall choice for shoppers who are considering both the Cadillac CT6 and the Mercedes-Benz S-Class.
When we compare the Cadillac CT6's and the Mercedes-Benz S-Class's specifications and ratings, the Cadillac CT6 has the advantage in the area of typical lower range of pricing for one- to five-year-old used cars. The Mercedes-Benz S-Class has the advantage in the areas of fuel efficiency, reliability, resale value, interior volume, overall quality score and base engine power. Based on this comparison of the Cadillac CT6's and the Mercedes-Benz S-Class's specifications and ratings, the Mercedes-Benz S-Class is a better car than the Cadillac CT6.
Pricing: A used 2020 Cadillac CT6 ranges from $32,683 to $60,572 while a used 2020 Mercedes-Benz S-Class is priced between $45,032 to $104,356.
Resale/Retained Value: Looking at the 5-year depreciation rate for both models, the Cadillac CT6 loses 57.2 percent of its value and the Mercedes-Benz S-Class loses 56.9 percent of its value. This means the Mercedes-Benz S-Class retains 0.3 percentage points more of its value and has the advantage of higher resale value versus the Cadillac CT6.
Quality Rating: The iSeeCars Overall Quality rating for the Cadillac CT6 is 6.4 out of 10 while the Mercedes-Benz S-Class' quality rating is 7.5 out of 10. This results in the Cadillac CT6 being ranked 18 out of 24 Best Luxury Large Cars and the Mercedes-Benz S-Class being ranked 6 out of 24.
Reliability Rating: iSeeCars’ Reliability Rating for the Cadillac CT6 is 5.9 out of 10. For the Mercedes-Benz S-Class the reliability rating is 8.1 out of 10. This gives the Mercedes-Benz S-Class an advantage in reliability compared to the Cadillac CT6.
Engine Power and Fuel Efficiency Comparison: For engine performance, the Cadillac CT6’s base engine makes 335 horsepower, and the Mercedes-Benz S-Class base engine makes 362 horsepower. The CT6 is rated to deliver an average of 21 miles per gallon, with a highway range of 518 miles. The S-Class is rated to deliver an average of 22 miles per gallon, with a highway range of 591 miles. This gives the Mercedes-Benz S-Class the fuel efficiency and maximum range advantage over the Cadillac CT6. The CT6 uses regular unleaded, and the S-Class uses premium unleaded.
Passenger Space Comparison: While both models are large cars, the Mercedes-Benz S-Class has the advantage of offering more interior volume, reflected in more front shoulder room, rear shoulder room, and cargo space. The Cadillac CT6 has the advantage in the areas of front head room, front leg room, rear head room and rear leg room.
New Car Pricing
Asking Price:
-
Starting MSRP:
$58,995
Category Avg Starting MSRP:
(Luxury Large Cars)
$87,679
Category Starting MSRP Range:
(Luxury Large Cars)
$46,305 - $138,600
New Car Pricing
Asking Price:
-
Starting MSRP:
$94,250
Category Avg Starting MSRP:
(Luxury Large Cars)
$87,679
Category Starting MSRP Range:
(Luxury Large Cars)
$46,305 - $138,600
Used Car Pricing
Avg Used Car Price:
$44,145
Price Range:
$32,683 - $60,572
Category Avg Price:
(Luxury Large Cars)
$59,916
Category Avg Price Range:
(Luxury Large Cars)
$31,809 - $111,938
# Used Cars for Sale Nationally:
17
Avg Mileage of Used Cars for Sale:
46,345
# Good or Great Deals:
7
Used Car Pricing
Avg Used Car Price:
$62,669
Price Range:
$45,032 - $104,356
Category Avg Price:
(Luxury Large Cars)
$59,916
Category Avg Price Range:
(Luxury Large Cars)
$31,809 - $111,938
# Used Cars for Sale Nationally:
99
Avg Mileage of Used Cars for Sale:
45,501
# Good or Great Deals:
37
Cadillac CT6 Scores & Rankings
Overall Score:
6.4 / 10
Reliability:
5.9 / 10
Retained Value:
6.9 / 10
Safety:
Not available
Mercedes-Benz S-Class Scores & Rankings
Overall Score:
7.5 / 10
Reliability:
8.1 / 10
Retained Value:
7.0 / 10
Safety:
Not available
iSeeCars Reliability Insights for Cadillac CT6
Remaining Life Expectancy (years):
8.3
Typical Category Remaining Life Expectancy:
(Luxury Large Cars)
7.2
Category Remaining Life Expectancy Range:
(Luxury Large Cars)
3.7 - 10.7
Chance of Reaching 200k Miles for a New Car:
2.1%
iSeeCars Reliability Insights for Mercedes-Benz S-Class
Remaining Life Expectancy (years):
6.1
Typical Category Remaining Life Expectancy:
(Luxury Large Cars)
7.2
Category Remaining Life Expectancy Range:
(Luxury Large Cars)
3.7 - 10.7
Chance of Reaching 200k Miles for a New Car:
1.4%
Expected 30-year Lifetime Recalls
Expected Lifetime Recalls:
1.5
Typical Category Recalls:
(Luxury Large Cars)
2
Category Range for Recalls:
(Luxury Large Cars)
0.6 - 36
Expected 30-year Lifetime Recalls
Expected Lifetime Recalls:
1.9
Typical Category Recalls:
(Luxury Large Cars)
2
Category Range for Recalls:
(Luxury Large Cars)
0.6 - 36
Cadillac CT6 Rankings
Ranking
1 out of / 24Ranking
2 out of / 2Ranking
4 out of / 24Ranking
6 out of / 24Ranking
9 out of / 24Ranking
12 out of / 24Ranking
18 out of / 24Ranking
19 out of / 24Mercedes-Benz S-Class Rankings
Ranking
1 out of / 24Ranking
2 out of / 24Ranking
2 out of / 24Ranking
3 out of / 24Ranking
3 out of / 24Ranking
6 out of / 24Ranking
7 out of / 8Ranking
8 out of / 11Ranking
11 out of / 24Available Body Styles
Sedan
Available Body Styles
Convertible, Coupe, Sedan
Available Drivetrain Options
Gasoline
Available Drivetrain Options
Gasoline, Plug-In Hybrid
Cadillac CT6 Trim Levels
3.6L Luxury, 3.6L Premium Luxury, 4.2TT Platinum
Mercedes-Benz S-Class Trim Levels
Not yet available
Warranty Information
Warranty, Bumper-to-Bumper:
4 years / 50000 miles
Warranty, Powertrain:
6 years / 70000 miles
Warranty, Roadside Assistance:
6 years / 70000 miles
Warranty Information
Warranty, Bumper-to-Bumper:
4 years / 50000 miles
Warranty, Powertrain:
4 years / 50000 miles
Warranty, Roadside Assistance:
4 years / 50000 miles
Safety Ratings
NHTSA Safety Rating (last 5 year average):
Not yet available
2025 NHTSA Overall Rating:
Not yet available
2025 NHTSA Front Crash Overall Rating:
Not yet available
2025 NHTSA Side Crash Overall Rating:
Not yet available
2025 NHTSA Rollover Rating:
Not yet available
IIHS Safety Rating:
Not yet available
Safety Ratings
NHTSA Safety Rating (last 5 year average):
Not yet available
2025 NHTSA Overall Rating:
Not yet available
2025 NHTSA Front Crash Overall Rating:
Not yet available
2025 NHTSA Side Crash Overall Rating:
Not yet available
2025 NHTSA Rollover Rating:
Not yet available
IIHS Safety Rating:
Not yet available
Base Drivetrain Specs
Horsepower:
335 hp @ 6800 rpm
Torque:
284 foot-lbs @ 5300 rpm
Power-to-Weight Ratio (higher is better):
0.082 hp per pound
Base Drivetrain Specs
Horsepower:
362 hp @ 5500 rpm
Torque:
369 foot-lbs @ 1800 rpm
Power-to-Weight Ratio (higher is better):
0.080 hp per pound
Engine Specifications
Engine Size:
3.6 liters
Engine Configuration:
V
Number of Cylinders:
6
Transmission:
Automatic
Standard/Optional Drivetrain Type:
AWD
EPA Fuel Economy
(City/Highway/Combined MPG):
18 / 27 / 21
Range (city/hwy):
346 / 518 miles
Recommended Fuel Type:
Regular Unleaded
Engine Specifications
Engine Size:
3 liters
Engine Configuration:
V
Number of Cylinders:
6
Transmission:
Automatic
Standard/Optional Drivetrain Type:
RWD / AWD
EPA Fuel Economy
(City/Highway/Combined MPG):
19 / 28 / 22
Range (city/hwy):
401 / 591 miles
Recommended Fuel Type:
Premium Unleaded
Standard/Optional Features
Alloy wheels:
Standard
Android Auto:
Standard
Apple CarPlay:
Standard
Bench Seats:
Standard
Bluetooth:
Standard
Heated Seats
Standard
Keyless Entry:
Standard
Keyless Ignition:
Standard
Leather Upholstery:
Standard
Navigation System:
Standard
Paddle Shifters:
Standard
Parking Sensors:
Standard
Power outlet:
Standard
Roadside assistance:
Standard
Satellite radio:
Standard
Sunroof/Moonroof:
Standard
Voice Recognition:
Standard
Wifi:
Standard
Wireless Smartphone Charging:
Standard
Adaptive Cruise Control:
Available
Automatic Parking:
Available
Cooled/Ventilated Seats:
Available
Heated Steering Wheel:
Available
Massage Seats:
Available
Power Lift Gate:
Available
Air Suspension:
N/A
Captain's seat:
N/A
Front Bench Seats:
N/A
Internet Radio:
N/A
Panoramic Sunroof/Moonroof
N/A
Quad Seats:
N/A
Roof Rack:
N/A
Trailer Hitch:
N/A
Standard/Optional Features
Alloy wheels:
Standard
Android Auto:
Standard
Apple CarPlay:
Standard
Bench Seats:
Standard
Bluetooth:
Standard
Heated Seats
Standard
Keyless Entry:
Standard
Keyless Ignition:
Standard
Leather Upholstery:
Standard
Navigation System:
Standard
Paddle Shifters:
Standard
Parking Sensors:
Standard
Power outlet:
Standard
Roadside assistance:
Standard
Satellite radio:
Standard
Sunroof/Moonroof:
Standard
Voice Recognition:
Standard
Wifi:
Standard
Wireless Smartphone Charging:
Standard
Adaptive Cruise Control:
Available
Automatic Parking:
Standard
Cooled/Ventilated Seats:
Available
Heated Steering Wheel:
Available
Massage Seats:
Available
Power Lift Gate:
Standard
Air Suspension:
Standard
Captain's seat:
N/A
Front Bench Seats:
N/A
Internet Radio:
Standard
Panoramic Sunroof/Moonroof
Available
Quad Seats:
N/A
Roof Rack:
N/A
Trailer Hitch:
N/A
Safety Features
Backup camera:
Standard
Blind Spot Monitoring:
Standard
Forward Collision Warning:
Standard
Lane Departure Warning:
Standard
Lane Keeping Assist:
Standard
Pedestrian Detection:
Standard
Rear Cross-Traffic Alert:
Standard
Rear Seat Reminder:
Standard
360-Degree Camera:
Available
Driver Attention Monitoring:
Available
Safety Features
Backup camera:
Standard
Blind Spot Monitoring:
Standard
Forward Collision Warning:
Standard
Lane Departure Warning:
Standard
Lane Keeping Assist:
Available
Pedestrian Detection:
N/A
Rear Cross-Traffic Alert:
Available
Rear Seat Reminder:
N/A
360-Degree Camera:
Available
Driver Attention Monitoring:
Standard
Interior Dimensions
Front Head Room:
40.2 inches
Front Leg Room:
46.4 inches
Front Shoulder Room:
58.3 inches
Rear Head Room:
38 inches
Rear Leg Room:
40.4 inches
Rear Shoulder Room:
56.2 inches
Cargo Space:
15.8 cubic feet
Overall Interior Volume:
110.0 cubic feet
Interior Dimensions
Front Head Room:
39.7 inches
Front Leg Room:
41.4 inches
Front Shoulder Room:
59.7 inches
Rear Head Room:
37.4 inches
Rear Leg Room:
34.1 inches
Rear Shoulder Room:
59.1 inches
Cargo Space:
16.3 cubic feet
Overall Interior Volume:
112.0 cubic feet
Exterior Dimensions
Curb Weight:
4063 lbs
Width:
74 inches
Height:
58 inches
Length:
205.8 inches
Wheelbase:
122.4 inches
Ground Clearance:
Not yet available
Exterior Dimensions
Curb Weight:
4553 lbs
Width:
83.9 inches
Height:
58.8 inches
Length:
206.9 inches
Wheelbase:
124.6 inches
Ground Clearance:
5 inches
Standard Wheel/Tire Information
Wheel Size:
19.0 x 8.5 inches
Wheel Type:
painted aluminum alloy
Tire Size:
P245/45R19
Standard Wheel/Tire Information
Wheel Size:
18.0 x 8.0 inches
Wheel Type:
aluminum alloy
Tire Size:
245/50R18
Exterior Colors
Black
Black Raven / Stellar Black Metallic
Gray
Manhattan Noir Metallic / Satin Steel Metallic / Shadow Metallic
Red
Red Horizon Tintcoat
Silver
Radiant Silver Metallic
White
Crystal White Tricoat
Beige
Not available
Blue
Not available
Green
Not available
Exterior Colors
Black
Black / Magnetite Black Metallic / Obsidian Black Metallic
Gray
Selenite Grey Metallic
Red
Ruby Black Metallic
Silver
Diamond Silver Metallic / Iridium Silver Metallic
White
designo Cashmere White Magno Matte / designo Diamond White Metallic
Beige
Dune Silver Metallic
Blue
Anthracite Blue Metallic / Lunar Blue Metallic
Green
Emerald Green Metallic
Interior Colors
Beige
Sahara Beige w/Jet Black Accents
Black
Jet Black
Brown
Not available
Gray
Not available
White
Not available
Interior Colors
Beige
Silk Beige/Deep Sea Blue / Silk Beige/Espresso Brown / Silk Beige/Titanium Grey Pearl
Black
Black
Brown
Mahogany/Silk Beige / Nut Brown/Black
Gray
Magma Grey/Espresso Brown
White
Porcelain/Black / Silk Beige/Satin Red Pearl
