2020 BMW 4 Series Convertible vs. 2019 Mercedes E-Class Cabriolet

Detailed Review, Specifications & Comparison

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Both the 4 Series Convertible and the E-Class Cabriolet 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, daytime running lights, rearview cameras, available all wheel drive and around view monitors.


The 4 Series Convertible’s corrosion warranty is 7 years longer than the E-Class Cabriolet’s (12 vs. 5 years).

BMW pays for scheduled maintenance on the 4 Series Convertible for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the E-Class Cabriolet.


J.D. Power and Associates rated the 4 Series Convertible first among compact premium cars in their 2018 Initial Quality Study. The E-Class Cabriolet isn’t in the top three in its category.

J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks BMW 11th in initial quality, above the industry average. With 5 more problems per 100 vehicles, Mercedes is ranked 15th.

J.D. Power and Associates’ 2019 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 7th in reliability, above the industry average. With 12 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that BMW vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks BMW 9 places higher in reliability than Mercedes.

Fuel Economy and Range

On the EPA test cycle the 4 Series Convertible gets better fuel mileage than the E-Class Cabriolet:


4 Series Convertible


430i 2.0 turbo 4 cyl.

23 city/34 hwy

440i 3.0 turbo 6 cyl.

22 city/29 hwy


430i 2.0 turbo 4 cyl.

22 city/32 hwy

440i 3.0 turbo 6 cyl.

20 city/28 hwy

E-Class Cabriolet


450 3.0 turbo V6

20 city/27 hwy


450 3.0 turbo V6

19 city/26 hwy

AMG 53 3.0 turbo 6 cyl. Hybrid

20 city/26 hwy

Regenerative brakes improve the 4 Series Convertible’s fuel efficiency by converting inertia back into energy instead of wasting it. The E-Class Cabriolet doesn’t offer a regenerative braking system.

Environmental Friendliness

The U.S. Environmental Protection Agency (EPA) certifies the BMW 4 Series Convertible as a “Super Ultra Low Emissions Vehicle” (SULEV). The Mercedes E-Class Cabriolet is only certified to “Ultra Low Emissions Vehicle” (ULEV) standards.

Tires and Wheels

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the 4 Series Convertible can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. Run-flat tires aren’t available on some tire packages on the E-Class Cabriolet.


The 4 Series Convertible is 7.3 inches shorter than the E-Class Cabriolet, making the 4 Series Convertible easier to handle, maneuver and park in tight spaces.

The 4 Series Convertible’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The E-Class Cabriolet doesn’t offer a retractable hardtop.

Passenger Space

The 4 Series Convertible has .4 inches more front legroom, .7 inches more rear headroom and 1.4 inches more rear shoulder room than the E-Class Cabriolet.


Heated windshield washer nozzles are standard on the 4 Series Convertible to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The E-Class Cabriolet doesn’t offer heated windshield washer nozzles.

Economic Advantages

Insurance will cost less for the 4 Series Convertible owner. The Car Book by Jack Gillis rates the 4 Series Convertible with a number “1” insurance rate while the E-Class Cabriolet is rated higher at a number “5” rate.

The 4 Series Convertible will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the 4 Series Convertible will retain 45.78% to 47.7% of its original price after five years, while the E-Class Cabriolet only retains 44.54% to 45.17%.

According to The Car Book by Jack Gillis, the 4 Series Convertible is less expensive to operate than the E-Class Cabriolet because it costs $73 less to do the manufacturer’s suggested maintenance for 50,000 miles. Typical repairs cost much less on the 4 Series Convertible than the E-Class Cabriolet, including $8 less for a water pump, $241 less for a muffler, $226 less for a starter, $21 less for fuel injection, $219 less for a fuel pump and $306 less for a power steering pump.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the BMW 4 Series Convertible will be $5525 to $10550 less than for the Mercedes E-Class Cabriolet.


The 4 Series Convertible was chosen as one of Automobile Magazine’s “All Stars” in 2014. The E-Class has never been an “All Star.”

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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