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The S4’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The AMG CLA 45 doesn’t offer pre-crash pretensioners.
Both the S4 and AMG CLA 45 have child safety locks to prevent children from opening the rear doors. The S4 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The AMG CLA 45’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
The S4’s standard pretensioning seatbelts also sense rear collisions and remove slack from the seatbelts to help protect the occupants from whiplash and other injuries. The AMG CLA 45 doesn’t offer a whiplash protection system.
The S4 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 CLA 45 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.
The S4 Prestige has a standard Top and Corner View Cameras to allow the driver to see objects all around the vehicle on a screen. The AMG CLA 45 only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.
To help make backing safer, the S4’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The AMG CLA 45 doesn’t offer a cross-path warning system.
Both the S4 and the AMG CLA 45 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, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems and blind spot warning systems.
The S4’s corrosion warranty is 7 years longer than the AMG CLA 45’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.
The S4’s 3.0 turbo V6 produces 19 lbs.-ft. more torque (369 vs. 350) than the AMG CLA 45’s 2.0 turbo 4-cylinder.
To lower fuel costs and make buying fuel easier, the Audi S4 uses regular unleaded gasoline (premium recommended for maximum performance). The AMG CLA 45 requires premium, which can cost 20 to 55 cents more per gallon.
An eight-speed automatic is standard on the Audi S4, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the AMG CLA 45.
For better traction, the S4 has larger standard tires than the AMG CLA 45 (245/40R18 vs. 235/35R19). The S4’s optional tires are larger than the largest tires available on the AMG CLA 45 (255/35R19 vs. 235/35R19).
The S4 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 CLA 45; it requires you to depend on roadside assistance and your vehicle will have to be towed.
For a smoother ride and more stable handling, the S4’s wheelbase is 4.7 inches longer than on the AMG CLA 45 (111 inches vs. 106.3 inches).
The S4 has 1.1 inches more front legroom, 2 inches more rear headroom, 8.6 inches more rear legroom and 1.3 inches more rear shoulder room than the AMG CLA 45.
With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the S4 offers cargo security. The AMG CLA 45’s non-lockable folding seat and non-lockable remote release defeat cargo security.
The S4 uses gas struts to support the hood for easier service access. The AMG CLA 45 uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.
The engine in the S4 is mounted longitudinally (North-South), instead of sideways, as in the AMG CLA 45. This makes it easier to service and maintain, because the accessory belts are in front.
The S4 Prestige has a standard heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The AMG CLA 45 doesn’t offer a heads-up display.
The S4’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The AMG CLA 45’s cruise control switches are unlit, making them difficult to find at night and operate safely.
Heated windshield washer nozzles are standard on the S4 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The AMG CLA 45 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 S4 Prestige has standard headlight washers to keep headlight output high. The AMG CLA 45 doesn’t offer headlight washers.
While driving with high beams on, sensitive light sensors standard on the S4 detect other vehicles which could be blinded and automatically switch to low beams. The AMG CLA 45 doesn’t offer automatic dimming high beams.
To help drivers avoid possible obstacles, the S4 has standard cornering lights to illuminate around corners when the turn signals are activated. The AMG CLA 45 doesn’t offer cornering lights.
Both the S4 and the AMG CLA 45 have standard heated front seats. The S4 Premium Plus/Prestige also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the AMG CLA 45.
Optional air-conditioned seats in the S4 Premium Plus/Prestige keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The AMG CLA 45 doesn’t offer air-conditioned seats.
On extremely cold winter days, the S4 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 CLA 45 doesn’t offer a heated steering wheel.
The S4 has standard massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the AMG CLA 45.
Insurance will cost less for the S4 owner. The Complete Car Cost Guide estimates that insurance for the S4 will cost $5885 to $6590 less than the AMG CLA 45 over a five-year period.
IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Audi S4 will be $667 to $6575 less than for the Mercedes AMG CLA 45.
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