Compare the2025 Mercedes C-Class SedanVS 2025 BMW 3 Series Sedan

For enhanced safety, the front and rear seat shoulder belts of the Mercedes C-Class Sedan 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 BMW 3 Series Sedan doesn’t offer pretensioners for its rear seat belts.

For enhanced safety, the front seat shoulder belts of the Mercedes C-Class Sedan 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 BMW 3 Series Sedan doesn’t offer height-adjustable seat belts.

The C-Class Sedan has a standard front seat center airbag, which deploys between the driver and front passenger, protecting them from injuries caused by striking each other in serious side impacts. The 3 Series Sedan doesn’t offer front seat center airbags.

Earlier warning of stopped traffic, traffic signals, dangerous road conditions, weather, or accidents, can keep driver's safer and prevent crashes. The C-Class Sedan offers optional Car-to-X Communication, a system that seamlessly communicates important warnings to the driver about impending danger, if they're available. The 3 Series Sedan doesn’t offer a system that can receive automated systems from infrastructure or other vehicles.

The C-Class Sedan has a standard blind spot warning system that uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. A system to reveal vehicles in the 3 Series Sedan’s blind spot costs extra.

To help make backing out of a parking space safer, the C-Class Sedan has standard Rear Cross-Traffic Alert and Active Brake Assist automatically engages the brakes to help avoid a collision. BMW charges extra for Cross Traffic Warning on the 3 Series Sedan and the 3 Series Sedan’s Cross Traffic Warning does not include automatic braking.

Both the C-Class Sedan and the 3 Series Sedan have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, rearview cameras, driver alert monitors, available all wheel drive, lane departure warning systems and around view monitors.

The Mercedes C-Class Sedan achieved a “Top Safety Pick” rating from the Insurance Institute for Highway Safety (IIHS) for the 2024 model year. This recognition was based on its impressive performance in the small overlap frontal crash test, updated side impact crash test, headlight evaluations, and pedestrian crash prevention testing. The 3 Series Sedan has not yet been fully evaluated by the IIHS for 2024.

There are over 10 percent more Mercedes dealers than there are BMW dealers, which makes it easier should you ever need service under the C-Class Sedan’s warranty.

The C-Class Sedan has 6.8 gallons more fuel capacity than the 3 Series Sedan 330e’s standard fuel tank (17.4 vs. 10.6 gallons), for longer range between fill-ups. The C-Class Sedan has 1.8 gallons more fuel capacity than the 3 Series Sedan’s standard fuel tank (17.4 vs. 15.6 gallons).

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes C-Class Sedan higher (7 out of 10) than the BMW 3 Series Sedan (6 to 7). This means the C-Class Sedan produces up to 1.1 pounds less smog-producing pollutants than the 3 Series Sedan every 15,000 miles.

A nine-speed automatic is standard on the Mercedes C-Class Sedan, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the 3 Series Sedan.

The C-Class Sedan stops much shorter than the 3 Series Sedan:

For better traction and acceleration, the C-Class Sedan has larger standard rear tires than the 3 Series Sedan (245/40R18 vs. 225/45R18).

The C-Class Sedan’s standard 245/40R18 rear tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the 330i’s standard 45 series tires.

The C-Class Sedan’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The 3 Series Sedan doesn’t offer drift compensation steering.

For better handling and stability, the track (width between the wheels) on the C-Class Sedan is .1 inches wider in the front and 1.1 inches wider in the rear than on the 3 Series Sedan.

The C 300 Sedan 4MATIC handles at .91 G’s, while the 330i xDrive pulls only .89 G’s of cornering force in a Car and Driver skidpad test.

For better maneuverability, the C-Class Sedan’s turning circle is 3.1 feet tighter than the 3 Series Sedan’s (36.3 feet vs. 39.4 feet). The C-Class Sedan 4MATIC’s turning circle is 1.8 feet tighter than the 3 Series Sedan’s (37.6 feet vs. 39.4 feet).

The design of the Mercedes C-Class Sedan amounts to more than styling. The C-Class Sedan has an aerodynamic coefficient of drag of .24 Cd. That is lower than the 3 Series Sedan (.26) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the C-Class Sedan get better fuel mileage.

The C-Class Sedan has 1.3 inches more front headroom, .3 inches more front shoulder room, .8 inches more rear legroom and 1 inch more rear shoulder room than the 3 Series Sedan.

Unlike the driver-only memory system in the 3 Series Sedan, the C-Class Sedan has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The C-Class Sedan’s standard easy entry and exit feature raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. The 3 Series Sedan doesn’t offer an easy entry system.

The C-Class Sedan’s standard Keyless-Go allow you to unlock the doors from any outside door handle, open the trunk, and start the engine, all without removing the key from the pocket or purse. Comfort Go standard on the 3 Series Sedan only offers hands-free access for the ignition, none to unlock the car.

Heated windshield washer nozzles are optional on the C-Class Sedan to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The 3 Series Sedan doesn’t offer heated windshield washer nozzles.

Consumer Reports rated the C-Class Sedan’s headlight performance “Excellent,” a higher rating than the 3 Series Sedan’s headlights, which were rated “Fair.”

A power rear sunshade and manual rear side window sunshades are standard in the C-Class Sedan to help block heat and glare for the rear passengers. The 3 Series Sedan doesn’t offer a rear or rear side window sunshades.

Optional air-conditioned seats in the C-Class Sedan keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The 3 Series Sedan doesn’t offer air-conditioned seats.

The C-Class Sedan has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The 3 Series Sedan doesn’t offer a house-current electrical outlet.