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For enhanced safety, the front and rear seat shoulder belts of the Audi S4 have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Cadillac CT4 V-Series doesn’t offer pretensioners for the rear seat belts.
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 CT4 V-Series doesn’t offer pre-crash pretensioners.
For enhanced safety, the front seat shoulder belts of the Audi S4 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Cadillac CT4 V-Series doesn’t offer height-adjustable seat belts.
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 CT4 V-Series 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 S4. But it costs extra on the CT4 V-Series.
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 CT4 V-Series 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.
Both the S4 and the CT4 V-Series have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, 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 and rear cross-path warning.
The S4’s corrosion warranty is 6 years longer than the CT4 V-Series’ (12 vs. 6 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 Cadillac vehicles. J.D. Power ranks Audi 8th in reliability, above the industry average. With 42 more problems per 100 vehicles, Cadillac is ranked 23rd.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Audi vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks Audi 16 places higher in reliability than Cadillac.
The S4’s 3.0 turbo V6 produces 24 more horsepower (349 vs. 325) than the CT4 V-Series’ 2.7 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 CT4 V-Series requires premium, which can cost 20 to 55 cents more per gallon.
For better stopping power the S4’s brake rotors are larger than those on the CT4 V-Series:
For better traction, the S4 has larger standard tires than the CT4 V-Series (245/40R18 vs. 235/40R18). The S4’s optional tires are larger than the largest tires available on the CT4 V-Series (255/35R19 vs. 235/40R18).
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 CT4 V-Series; 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 CT4 V-Series don’t have a run-flat feature, either.
For a smoother ride and more stable handling, the S4’s wheelbase is 1.7 inches longer than on the CT4 V-Series (111 inches vs. 109.3 inches).
For better handling and stability, the track (width between the wheels) on the S4 is 1.6 inches wider in the front than on the CT4 V-Series.
The S4 has .7 inches more front shoulder room, .9 inches more rear headroom, 2.3 inches more rear legroom and .6 inches more rear shoulder room than the CT4 V-Series.
The S4 has a much larger trunk than the CT4 V-Series (12 vs. 10.7 cubic feet).
With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the S4 offers cargo security. The CT4 V-Series’ non-lockable folding seat and non-lockable remote release defeat cargo security.
To make loading groceries and cargo easier when your hands are full, the S4’s available trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The CT4 V-Series doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.
The S4 uses gas struts to support the hood for easier service access. The CT4 V-Series 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 S4’s front and rear power windows all open or close with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside of the car. The CT4 V-Series’ rear power window switches have to be held the entire time to close them fully.
If the windows are left open on the S4 the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the CT4 V-Series can only close the windows from inside the vehicle, with the ignition on.
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 CT4 V-Series 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 CT4 V-Series doesn’t offer headlight washers.
Manual rear side window sunshades are available in the S4 to help block heat and glare for the rear passengers. The CT4 V-Series doesn’t offer rear side window sunshades.
The S4 has standard heated front seats. Heated front seats cost extra on the CT4 V-Series. 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 CT4 V-Series.
The S4 Prestige’s Park Steering Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The CT4 V-Series doesn’t offer an automated parking system.
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