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The S5 has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The AMG C-Class Cabriolet doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S5. But it costs extra on the AMG C-Class Cabriolet.
When descending a steep, off-road slope, the S5’s standard Hill Descent Control allows you to creep down safely. The AMG C-Class Cabriolet doesn’t offer Hill Descent Control.
Both the S5 and the AMG C-Class Cabriolet have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.
For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, and its standard front crash prevention system, the Insurance Institute for Highway Safety grants the S5 the rating of “Top Pick” for 2017, a rating granted to only 185 vehicles tested by the IIHS. The AMG C-Class Cabriolet has not been tested, yet.
The S5’s corrosion warranty is 7 years longer than the AMG C-Class Cabriolet’s (12 vs. 5 years).
J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Audi vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Audi 8th in reliability, above the industry average. With 10 more problems per 100 vehicles, Mercedes is ranked 13th.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Audi vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Audi 7 places higher in reliability than Mercedes.
On the EPA test cycle the S5 Cabriolet gets better fuel mileage than the AMG C 43 Cabriolet 4x4 (19 city/26 hwy vs. 18 city/25 hwy).
Regenerative brakes improve the S5’s fuel efficiency by converting inertia back into energy instead of wasting it. The AMG C-Class Cabriolet doesn’t offer a regenerative braking system.
To lower fuel costs and make buying fuel easier, the Audi S5 uses regular unleaded gasoline (premium recommended for maximum performance). The AMG C-Class Cabriolet requires premium, which can cost 20 to 55 cents more per gallon.
The S5 stops shorter than the AMG C-Class Cabriolet:
AMG C-Class Cabriolet
70 to 0 MPH
Car and Driver
For better traction, the S5 has larger standard tires than the AMG C-Class Cabriolet (245/40R18 vs. 225/45R18). The S5’s optional tires are larger than the largest tires available on the AMG C-Class Cabriolet (265/30R20 vs. 255/40R18).
The S5’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the AMG C 43 Cabriolet’s standard 45 series front tires. The S5’s optional tires have a lower 30 series profile than the AMG C-Class Cabriolet’s optional 35 series front tires.
For better ride, handling and brake cooling the S5 offers optional 20-inch wheels. The AMG C-Class Cabriolet’s largest wheels are only 19-inches in the front and 20-inches in the rear.
The S5 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the AMG C-Class Cabriolet; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some tire options on the AMG C-Class Cabriolet don’t have a run-flat feature, either.
For better maneuverability, the S5’s turning circle is .7 feet tighter than the AMG C 43 Cabriolet’s (37.7 feet vs. 38.4 feet). The S5’s turning circle is 1 foot tighter than the AMG C-Class Cabriolet’s (37.7 feet vs. 38.7 feet).
The Audi S5 may be more efficient, handle and accelerate better because it weighs about 100 to 350 pounds less than the Mercedes AMG C-Class Cabriolet.
The S5 Cabriolet has a larger trunk with its top down than the AMG C-Class Cabriolet with its top down (7.3 vs. 7 cubic feet). The S5 Cabriolet has a larger trunk with its top up than the AMG C-Class Cabriolet with its top up (9.3 vs. 8.8 cubic feet).
To make loading groceries and cargo easier when your hands are full, the S5’s available trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The AMG C-Class Cabriolet doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.
Heated windshield washer nozzles are standard on the S5 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The AMG C-Class Cabriolet doesn’t offer heated windshield washer nozzles.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The S5 Prestige has standard headlight washers to keep headlight output high. The AMG C-Class Cabriolet doesn’t offer headlight washers.
On extremely cold winter days, the S5 Premium Plus/Prestige’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The AMG C-Class Cabriolet doesn’t offer a heated steering wheel.
The S5 has standard massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the AMG C-Class Cabriolet.
Insurance will cost less for the S5 owner. The Complete Car Cost Guide estimates that insurance for the S5 will cost $20 to $4640 less than the AMG C-Class Cabriolet over a five-year period.
IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Audi S5 will be $14762 to $17507 less than for the Mercedes AMG C-Class Cabriolet.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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