2018 Audi S6 Sedan

With 4.0L Turbocharged V8 type engine and 7-Speed Dual Clutch Automatic type transmission, the sedan offers best in class performance and efficiency. The sedan takes 4 seconds to reach 60 mph from a standstill position. In addition to its German competitors, 2018 Audi S6 competes with Jaguar XF, Cadillac CT6, and Lexus GS.

The 2018 Audi S6 is offered in two trims: Premium Plus and Prestige. Both share the same powertrain, body, and interior, and differ mainly in the details. Both use 4.0 Turbocharged V8 engine and 7-Speed Dual Clutch Automatic Transmission system. The engine produces a power of 450 hp and a torque of 406 lb-ft.

Trims	Premium Plus	Prestige
Starting MSRP	$71,900	$74,400
Features	Full LED headlights Valcona leather seats Three-spoke multifunction flat-bottom sport steering wheel with shift paddles MMI Navigation plus with voice control system Audi side assist with pre sense rear	All features included in Premium Plus and: LED interior lighting Head-up display with navigation information Parking system plus with a top view camera (front and rear acoustic parking sensors) Power rear window, manual rear side window sunshades Power trunk

Prestige differs from Premium Plus in terms of the features as it provides LED interior lighting, Head-up display with navigation information, power trunk and many more with all the features included in Premium Plus.

We Recommend

The best choice would be the Audi S6 Premium Plus. Although it is the base model but provides all the features that you really need. With some extra bucks, one can get some extra features such as red brake calipers, Interior Lighting and many more.

"This is a car that's more about refinement and daily driving than driving engagement. Rapid and undramatic acceleration, but frustrating steering and handling qualities when you get even modestly enthusiastic with it. Very smooth transmission. Great engine; mediocre chassis and tires."- Edmunds

Engine and Transmission

Audi S6’s 4.0 L Turbocharged V8 engine can produce a power of 450 hp at 5800 rpm and a torque of 406 lb-ft at 1400 rpm. It comes paired with a 7-Speed Dual Clutch Automatic Transmission System. Audi S6’s engine is one of the best among its rivals. Only BMW M550i xDrive’s engine produces better torque and power than S6’s with a cost higher by $2,000. It uses 8-Speed Automatic Transmission System.

Mercedes E43 AMG with almost same price produces relatively very less torque and power. Cadillac CTS V-Sport has less price with better transmission system than S6 but comparatively less power and torque.

Models	Audi S6	BMW M550i xDrive	Mercedes E43 AMG	Cadillac CTS V-Sport
Starting MSRP	$71,900	$73,900	$71,600	$62,190
Engine	4.0L Turbocharged V8	4.4L Turbocharged V8	3.0L Turbocharged V6	3.6L Turbocharged V6
Transmission	7-Speed Dual Clutch Automatic	8-Speed Automatic	9-Speed Automatic	8-Speed Automatic
Power	450 hp	456 hp	396 hp	420 hp
Torque	406 lb-ft	480 lb-ft	384 lb-ft	430 lb-ft

Acceleration

Audi S6 has got an efficient 4.0 L Twin-Turbocharged V8 engine which can reach a speed of 60 mph from a standstill position in just 3.9 seconds and even can cover a quarter mile in 12.4 seconds at a speed of 113 mph.

Models	Audi S6	BMW M550i xDrive	Mercedes E43 AMG	Cadillac CTS V-Sport
0-60 MPH	3.9 Seconds	3.8 Seconds	4.2 Seconds	4.5 Seconds
Quarter mile	12.4 Seconds @ 113 mph	12.3 Seconds @  115 mph	12.8 Seconds @ 109 mph	12.9 Seconds @ 112 mph
Engine	4.0L Turbocharged V8	4.4L Turbocharged V8	3.0L Turbocharged V6	3.6L Turbocharged V6
Emission Tons/yr of CO2 Emissions @ 15K mi/year	8.4	9.3	8.4	9.3

BMW M550i xDrive is the only car in the class which takes lesser time to reach 60 mph for standstill position than S6 by a difference of just 0.1 seconds but it emits more CO2 than S6. Both Mercedes E43 AMG and Cadillac CTS V-Sport trails them for reaching 60 mph and even to cover a quarter mile.

Steering and Handling

Steering is very quick around the center. At low speeds, it is very light, quick and feels very synthetic. At moderate speeds, the steering still feels non-linear after turn-in and requires more input to achieve an equal amount of turning.

Audi S6 uses Rack and Pinion type steering system with a turning diameter (Curb to Curb of 39 ft.).  Not an impressive-handling even in moderately hard driving. The sport differential requires the use of the throttle to counter this behavior, demanding a clunky driving style.

Braking

Audi S6 is not the best when it comes to the braking. It has noisy brakes. The ABS comes installed in all the four wheels. Our measured 60-to-zero-mph stop in 112 feet is about average for the class.

Model	Audi S6	BMW M550i xDrive	Mercedes E43 AMG	Cadillac CTS V-Sport
Brake Front(in)	15.7	N/A	14.2	12.6
Brake Rear(in)	14	N/A	14.2	12.4
Curb Weight(lbs)	4497	3878	4145	3992
60-0 MPH (ft.)	112	106	110	107

Audi S6 is the heaviest car among its rivals, around 600 lbs more than its closest rivals. Moreover, its stopping distance from zero of 60 mph is maximum in the class. The only car closest to Audi S6 in both the criteria is Mercedes E43 AMG.

Audi S6 is very easy to live with routine driving situations. The engine stop-start function could be better; restarts take a beat before thrust can be delivered. S6 returns a mileage of 18 mpg in the city and 27 mpg on the highway which combines to 22 mpg which is above par for the class.

Model	Audi S6	BMW M550i xDrive	Mercedes E43 AMG	Cadillac CTS V-Sport
MPG City	18	16	19	16
MPG Highway	27	25	25	24
MPG Combine	22	19	22	20

Mercedes E43 AMG is the only rival which has higher mileage than S6 in the city by just 1 mpg but lacks on the highway. Other competitors, BMW M550i xDrive and Cadillac CTS V-Sport have lower mileage in both cities as well as on the highway.

"The 2018 Audi S6 hasn’t been redesigned as recently as many other cars in the class, but it still boasts one of the nicest interiors among luxury midsize sedans. Soft-touch materials are everywhere, and both rows of seats are spacious and supportive. There are plenty of standard and available tech features, headlined by the easy-to-use MMI infotainment system. Trunk space is average for the class." - cars.usnews

Seating and Comfort

Audi S6 has a seating of four and ample space, making this car more practical. Similar to Audi A6, it has a comfortable seating for four members with enough room for plenty of gear. By the numbers, the S6 has 114.8 inches between the wheels and is nearly 200 inches from end to end, which is a generous shadow for a mid-sizer.

Rear-seat passengers should have enough leg room to fit behind 6-footers. The trunk takes 14.1 cubic feet of cargo, which is enough plenty of luggage. BMW 5-series has a bigger trunk than S6 by just 25%. Inside, the S6 is trimmed with careful attention to detail and features one of the most straightforward layouts.

Model	Audi S6	BMW M550i xDrive	Mercedes E43 AMG	Cadillac CTS V-Sport
Passenger capacity	5	5	5	5
Passenger Volume(ft cube)	98	98.8	N/A	97
Front (Head/Shoulder/Leg) (In.)	37.2/57.5/41.3	38.8/58.7/41.4	37.9/57.8/41.3	40.4/56.9/45.7
Second (Head/Shoulder/Leg) (In.)	37.8/56.3/37.4	37.5/55.9/36.5	38.2/56.9/35.8	37.5/54.8/35.4

Controls fall within easy reach. It has knobs for temperature adjustment, buttons for fan speed. The multimedia system works well and stows in-dash. The flat-bottomed steering wheel looks neat but can feel odd in your hands. Good headroom in the front, even for 6-footers. The back seat is especially roomy with plenty of headroom, good shoulder room, and knee clearance.

Infotainment

Audi's MMI infotainment system is excellent, which got easy to learn controls. One'll be hard-pressed to find a better user-friendly interface or such a high-quality stereo than that of S6. The quiet interior of the S6 offers a good soundstage for the Bose sound system. The car has simple navigation and an easy-to-understand map with instructions doubled inside the instrument panel.

Bluetooth connects easily to any phone, and Audi's Connect system is easy to learn. Apple CarPlay and Android Auto are both standard, but Audi's systems are so logically designed that we used them most of the time instead. It's one of the best systems in the class.

Trunk Volume

The S6 begs to be loaded up and taken on a long road trip with a large trunk, ample small-item storage and, of course, large rear seat room. The cabin has a good amount of storage, with a two-tiered bin in the center console, a shallow bin in front of the shifter along with average-size door pockets.

Model	Audi S6	BMW M550i xDrive	Mercedes E43 AMG	Cadillac CTS V-Sport
Volume (ft cube)	14.1	18.7	13.1	13.7

The trunk has a low liftover height, soft opening, and concealed hinges. The standard trunk offers average width and height but the Prestige Trim got a power trunk lid. 

Interior Features

• Power Tilt/Telescoping Steering Column
• Power Rear Windows
• Front and Rear Cupholder
• Proximity Key For Doors And Push Button Start
• Power Fuel Flap Locking Type
• Home-Link Garage Door Transmitter
• Valcona Leather Seat Trim -inc: diamond stitching
• Front And Rear Map Lights
• Fade-To-Off Interior Lighting
• Memory Settings -inc: Door Mirrors, Steering Wheel, and HVAC
• Power Door Locks w/Autolock Feature
• Refrigerated/Cooled Box Located In The Glovebox, Driver / Passenger And Rear Door Bins and 1st Row Underseat Storage
• 2 Seatback Storage Pockets

"The A6’s exterior features some bold elements, such as the recently upgraded headlights, grille, front bumper and LED taillights, but overall the shape and styling remain typically Audi conservative. Viewed from behind, the taillights have a sleek profile and are easy to pick out whenever you’re behind one, day or night."- Kelley Blue Book

Dimensions and weight

Being the heaviest in the class, S6 has least ground clearance and wheelbase. Other dimensions like Length, Height, and Width are average compared to its rivals.

Model	Audi S6	BMW M550i xDrive	Mercedes E43 AMG	Cadillac CTS V-Sport
Curb weight(lbs)	4497	3878	4145	3992
Length(in)	194.4	195.4	194.6	195.5
Width(in)	73.8	73.5	73.2	72.2
Height(in)	56.8	58.2	57	57.2
Ground clearance(in)	4.57	5.1	4.5	5.1
Wheelbase(in)	114.8	117.1	115.7	114.6
Track width(in) F/R	63.6/63.2	63/63.9	64.1/62.9	61.4/61.7

Exterior Features

• Compact Spare Tire Mounted Inside Under Cargo
• Clearcoat Paint
• Body-Colored Front and Rear Bumper
• Chrome Side Windows Trim and Black Front Windshield Trim
• Light Tinted Glass
• Galvanized Steel/Aluminum Panels
• Lip Spoiler
• Trunk Rear Cargo Access
• Perimeter/Approach Lights

 

The 2018 Audi S6 has only undergone crash tests conducted by National Highway Safety Traffic Administration (NHSTA) and has scored 5 stars in each of the crash tests. Although, the Audi S6 has not been tested by the IIHS.

 

NHTSA Rating

Overall Rating	5 star
Overall Frontal Barrier Crash Rating	5 star
Frontal Barrier Crash Rating Driver	5 star
Frontal Barrier Crash Rating Passenger	5 star
Overall Side Crash Rating	5 star
Side Barrier Rating	5 star
Side Barrier Rating Driver	5 star
Side Barrier Rating Passenger Rear Seat	5 star
Side Pole Rating Driver Front Seat	5 star
Combined Side Rating Front Seat	5 star
Combined Side Rating Rear Seat	5 star
Rollover Rating	5 star

2018 Audi S6 Safety Features

• Driver and front passenger dual-stage airbags, front thorax side airbags, knee airbags and Sideguard head curtain airbags
• Front passenger occupant detection for airbags
• Power central locking system with safety unlock feature if airbags deploy
• Anti-lock Brake System (ABS) with Electronic Brake-force Distribution (EBD) and brake assist
• Electronic Stability Control (ESC) with secondary collision brake assist and traction control (ASR)
• Anti-theft alarm system
• Tire-pressure monitoring system
• Safety belt reminder for driver and front passenger
• Lower anchors for child seats in rear seats
• Electromechanical parking brake

 BMW M550i xDrive VS Audi S6

Being costlier than Audi S6, BMW M550i xDrive has a more powerful engine with almost same acceleration with the S6 but S6 is a much better choice when it comes to the fuel economy section. BMW is way lighter than S6 and gives better ground clearance. Both have almost same interior space with the S6 having bigger cargo space.

Mercedes E43 AMG VS Audi S6

Both having an almost same price but a lot of difference in power and torque generated by their engines. S6 has way more powerful engine than Mercedes. Even Mercedes take more time to reach 60 mph from standstill position but it has a better transmission system than S6.

These both cars are best in their class when it comes to the mileage. They serve almost the same dimensions with an average ground clearance. Mercedes provide more space for seating and comfort but S6 has more cargo volume.

Cadillac CTS V-Sport VS Audi S6

Cadillac CTS V-Sport is the most economical car in the class with a good transmission system. Its engine is average in producing stable power and takes most time for acceleration. The car has average fuel economy in the class.

“ The 2018 Audi S6 stands with an impressive hand: quality interior, great performance, functional shape. Its possible to find better examples of other cars but they all cost significantly more.”- carconnection

With a bit weak steering and braking department, S6 stands tall in the safety department. Its interior makes it a High-Class luxury car. There are no flaws as such in this car. All in all, this is one of the best cars available in the segment.