Compare the2025 Audi S4VS 2025 Cadillac CT5-V

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 CT5-V doesn’t offer pretensioners for its 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 CT5-V doesn’t offer pre-crash pretensioners.

Both the S4 and CT5-V 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 CT5-V’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 CT5-V 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 CT5-V 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 CT5-V.

Both the S4 and the CT5-V have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, available blind spot warning systems, around view monitors and rear cross-path warning.

The S4’s corrosion warranty is 6 years longer than the CT5-V’s (12 vs. 6 years).

For smoother operation, better efficiency and fewer moving parts, the S4 has an overhead cam design, rather than the old pushrod design of the 6.2 supercharged V8 in the CT5-V.

As tested in Motor Trend the Audi S4 is faster than the Cadillac CT5-V turbo V6 (automatics tested):

On the EPA test cycle the S4 gets better mileage than the CT5-V:

Regenerative brakes improve the S4’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT5-V doesn’t offer a regenerative braking system.

To lower fuel costs and make buying fuel easier, the Audi S4 uses regular unleaded gasoline (premium recommended for maximum performance). The CT5-V requires premium, which can cost on average about 84.9 cents more per gallon.

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi S4 higher (4 out of 10) than the Cadillac CT5-V (2 to 4). This means the S4 produces up to 15.6 pounds less smog-producing pollutants than the CT5-V every 15,000 miles.

For better stopping power the S4’s standard brake rotors are larger than those on the CT5-V:

For better traction, the S4 has larger tires than the CT5-V (255/35R19 vs. 245/40R19).

The S4’s tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the CT5-V’s standard 40 series tires.

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 CT5-V; 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 CT5-V don’t have a run-flat feature, either.

For better maneuverability, the S4’s turning circle is .9 feet tighter than the CT5-V’s (38.1 feet vs. 39 feet). The S4’s turning circle is 4.3 feet tighter than the CT5-V Blackwing’s (38.1 feet vs. 42.4 feet).

The S4 is 6.3 inches shorter than the CT5-V, making the S4 easier to handle, maneuver and park in tight spaces.

A low lift-over trunk design makes loading and unloading the S4 easier. The S4’s trunk lift-over height is 26 inches, while the CT5-V’s liftover is 27.8 inches.

With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the S4 offers cargo security. The CT5-V’s non-lockable folding seat defeats cargo security.

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 CT5-V 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 CT5-V 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 CT5-V 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 CT5-V doesn’t offer rear side window sunshades.

Both the S4 and the CT5-V have standard heated front seats. The S4 Prestige also has standard heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the CT5-V.