Compare the2025 Audi A3VS 2025 Cadillac CT4

The A3’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The CT4 doesn’t offer pre-crash pretensioners.

For enhanced safety, the front seat shoulder belts of the Audi A3 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 doesn’t offer height-adjustable seat belts.

The A3 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 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 A3. But it costs extra on the CT4.

Both the A3 and CT4 offer rear cross-traffic warning, but the A3 with Rear Cross-Traffic Assist also has Automatic Brake Activation (automatically applies the brakes) to better prevent a collision when backing near traffic. The CT4’s Rear Cross Traffic Alert doesn’t automatically brake.

Both the A3 and the CT4 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, 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 and rear parking sensors.

The A3’s corrosion warranty is 6 years longer than the CT4’s (12 vs. 6 years).

The Audi A3’s engine uses a cast iron block for durability, while the CT4’s engines use an aluminum block. Aluminum engine blocks are much more prone to warp and crack at high temperatures than cast iron.

As tested in Consumer Reports the Audi A3 is faster than the Cadillac CT4 2.0 turbo 4-cylinder:

On the EPA test cycle the A3 gets better mileage than the CT4:

Regenerative brakes improve the A3’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT4 doesn’t offer a regenerative braking system.

To lower fuel costs and make buying fuel easier, the Audi A3 uses regular unleaded gasoline (premium recommended for maximum performance). The CT4 requires premium, which can cost on average about 84.9 cents more per gallon.

The A3 has a standard locking fuel door which locks and unlocks with the power locks. The fuel filler door is not lockable on the CT4. A locking fuel door helps prevent fuel theft and vandalism, such as sugar in the tank.

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi A3 higher (6 out of 10) than the Cadillac CT4 (5 to 6). This means the A3 produces up to 6.9 pounds less smog-producing pollutants than the CT4 every 15,000 miles.

The A3 offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The CT4 doesn’t offer an SMG or a conventional manual transmission.

For better stopping power the A3’s standard front brake rotors are larger than those on the CT4:

The A3 stops shorter than the CT4:

The A3 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; 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 don’t have a run-flat feature, either.

The A3 Premium Plus handles at .89 G’s, while the CT4 Premium Luxury AWD pulls only .83 G’s of cornering force in a Motor Trend skidpad test.

For better maneuverability, the A3’s turning circle is .7 feet tighter than the CT4’s (36.4 feet vs. 37.1 feet). The A3’s turning circle is 1.6 feet tighter than the CT4 AWD’s (36.4 feet vs. 38 feet).

The A3 is 10.3 inches shorter than the CT4, making the A3 easier to handle, maneuver and park in tight spaces.

The A3 has .1 inches more rear headroom and 1.8 inches more rear legroom than the CT4.

To make loading and unloading groceries and cargo easier, especially for short adults, the A3 has a standard power trunk, which opens and closes automatically by pressing a button, or optionally by just kicking your foot under the back bumper, completely leaving your hands free. The CT4 doesn’t offer a power trunk.

The A3’s standard towing capacity is much higher than the CT4’s (3461 vs. 1000 pounds).

The A3 uses gas struts to support the hood for easier service access. The CT4 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 A3’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’s rear power window switches have to be held the entire time to close them fully.

If the windows are left open on the A3 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 can only close the windows from inside the vehicle, with the ignition on.

The A3’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The CT4’s standard manually variable intermittent wipers have to be constantly adjusted.

Heated windshield washer nozzles are standard on the A3 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The CT4 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 A3 Prestige has standard headlight washers to keep headlight output high. The CT4 doesn’t offer headlight washers.

Both the Audi A3 and Cadillac CT4 offer exterior mirrors that can be folded to provide convenience. The A3 offers optional power folding mirrors, which allow for easy, one-touch folding or unfolding at the driver’s discretion. This provides added convenience when maneuvering or parking, as well as when walking past the parked vehicle. In comparison, the CT4’s foldable mirrors are manual, requiring the driver to get out and physically fold them once parked and unfold them before getting in.

The A3’s optional Park Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The CT4 doesn’t offer an automated parking system.

Consumer Reports® recommends the Audi A3, based on reliability, safety and performance. The Cadillac CT4 isn't recommended.

The Audi A3/S3/RS 3 outsold the Cadillac CT4 by 49% during 2023.