Compare the2026 BMW 4 Series Gran CoupeVS 2025 Mercedes C-Class Sedan

The BMW 4 Series Gran Coupe has standard driver and front passenger side knee airbags mounted low on the dashboard. These airbags help prevent the driver and front passenger from sliding under their seatbelts or the main frontal airbags; this keeps them better positioned during a collision for maximum protection. Knee airbags also help keep the legs from striking the dashboard, preventing knee and leg injuries in the case of a serious frontal collision. The C-Class Sedan doesn’t offer a front passenger side knee airbag.

The 4 Series Gran Coupe’s standard pretensioning seatbelts also sense rear collisions and remove slack from the front seatbelts to help protect the occupants from whiplash and other injuries. The C-Class Sedan doesn’t offer a whiplash protection system.

The 4 Series Gran Coupe’s standard lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. A lane departure warning system costs extra on the C-Class Sedan.

Both the 4 Series Gran Coupe and the C-Class Sedan have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, blind spot warning systems, rearview cameras, rear cross-path warning, driver alert monitors, available all wheel drive and around view monitors.

The 4 Series Gran Coupe’s corrosion warranty is 7 years longer than the C-Class Sedan’s (12 vs. 5 years).

BMW pays for scheduled maintenance on the 4 Series Gran Coupe for 3 years and 36,000 miles. BMW will pay for oil changes, tire rotations, air filter replacements, cabin filter replacement, brake fluid replacement, inspections, and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the C-Class Sedan.

J.D. Power and Associates’ 2025 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Mercedes vehicles. With 14 fewer problems per 100 vehicles, JD Power ranks BMW higher than Mercedes.

J.D. Power and Associates’ 2025 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that BMW vehicles are more reliable than Mercedes vehicles. J.D. Power ranks BMW above average in long-term dependability. With 13 more problems per 100 vehicles in the first three years of ownership, Mercedes is rated below average.

The M440i Coupe’s standard 3.0 turbo 6-cylinder hybrid produces 131 more horsepower (386 vs. 255) and 103 lbs.-ft. more torque (398 vs. 295) than the C-Class Sedan’s 2.0 turbo 4-cylinder hybrid.

On the EPA test cycle the 4 Series Gran Coupe gets better mileage than the C-Class Sedan:

To lower fuel costs and make buying fuel easier, the BMW 4 Series Gran Coupe uses regular unleaded gasoline (premium recommended for maximum performance). The C-Class Sedan requires premium, which can cost on average about 84.9 cents more per gallon.

The 4 Series Gran Coupe’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The C-Class Sedan doesn’t offer launch control.

For better stopping power the 4 Series Gran Coupe’s brake rotors are larger than those on the C-Class Sedan:

For better traction, the 4 Series Gran Coupe has larger standard tires than the C-Class Sedan (245/45R18 vs. 225/45R18). The 4 Series Gran Coupe’s optional front tires are larger than the largest tires available on the C-Class Sedan (F:245/40R19 & R:255/40R19 vs. F:225/40R19 & R:255/35R19).

The 4 Series Gran Coupe’s optional tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the C-Class Sedan’s optional 40 series front tires.

For better ride, handling and brake cooling the 4 Series Gran Coupe offers optional 20-inch wheels. The C-Class Sedan’s largest wheels are only 19-inches.

The 4 Series Gran Coupe offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The C-Class Sedan’s suspension doesn’t offer adjustable shock absorbers.

Both the 4 Series Gran Coupe and the C-Class Sedan have standard heated front seats. The 4 Series Gran Coupe also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the C-Class Sedan.

The BMW 4 Series comes in coupe, convertible and four door hatchback bodystyles; the Mercedes C-Class isn’t available as a coupe or convertible.

J.D. Power and Associates rated the 4 Series Gran Coupe first among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The C-Class Sedan isn’t in the top three.