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Compare the2023 BMW M4VS 2022 Mercedes AMG SL

2023 BMW M4
2022 Mercedes AMG SL

Safety

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The M4 has a standard PostCrash iBrake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The AMG SL 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.

Over 200 people are killed each year when backed over by motor vehicles. The M4 offers optional Active Park Distance Control that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The AMG SL doesn’t offer backup collision prevention brakes.

The M4’s standard lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. A lane departure warning system costs extra on the AMG SL.

To help make backing out of a parking space safer, the M4’s standard rear cross-path warning system uses sensors in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The AMG SL doesn’t offer a cross-path warning system.

Both the M4 and the AMG SL 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, blind spot warning systems, rearview cameras, driver alert monitors and available around view monitors.

Warranty

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The M4’s corrosion warranty is 7 years longer than the AMG SL’s (12 vs. 5 years).

BMW pays for scheduled maintenance on the M4 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 AMG SL.

Reliability

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J.D. Power and Associates’ 2022 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 above average in initial quality. With 24 more problems per 100 vehicles, Mercedes is rated below average.

J.D. Power and Associates’ 2022 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 5 more problems per 100 vehicles in the first three years of ownership, Mercedes is rated below average.

From surveys of all its subscribers, Consumer Reports’ January 2021 Auto Issue reports that BMW vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks BMW 8 places higher in reliability than Mercedes.

Fuel Economy and Range

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On the EPA test cycle the M4 Convertible gets better mileage than the AMG SL:

MPG

M4 Convertible

RWD

Manual

3.0 turbo 6-cyl.

16 city/23 hwy

Auto

3.0 turbo 6-cyl.

16 city/23 hwy

Auto

3.0 turbo 6-cyl.

16 city/23 hwy

AMG SL

AWD

Auto

63 4.0 turbo V8

14 city/21 hwy

55 4.0 turbo V8

14 city/21 hwy

Regenerative brakes improve the M4’s fuel efficiency by converting inertia back into energy instead of wasting it. The AMG SL doesn’t offer a regenerative braking system.

Tires and Wheels

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For better traction, the M4 has larger front tires than the AMG SL (275/40R18 vs. 265/40R20).

Suspension and Handling

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For a smoother ride and more stable handling, the M4’s wheelbase is 6.2 inches longer than on the AMG SL (112.5 inches vs. 106.3 inches).

For better maneuverability, the M4’s turning circle is .7 feet tighter than the AMG SL’s (40 feet vs. 40.7 feet).

Chassis

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The M4’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The AMG SL doesn’t offer a retractable hardtop.

Passenger Space

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Because it has more passenger and cargo room, the EPA rates the M4 Convertible a Subcompact car, while the AMG SL is rated a Minicompact.

The M4 Convertible has 8 cubic feet more passenger volume than the AMG SL (84 vs. 76).

Cargo Capacity

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The M4 Convertible has a much larger trunk with its top down than the AMG SL with its top down (10.6 vs. 7.5 cubic feet). The M4 Convertible has a much larger trunk with its top up than the AMG SL with its top up (13.6 vs. 8.5 cubic feet).

The M4’s standard rear seats fold to accommodate long and bulky cargo. The AMG SL doesn’t offer folding rear seats.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that BMW service is better than Mercedes. J.D. Power ranks BMW 7th in service department satisfaction (above the industry average). With a 17% lower rating, Mercedes is ranked 18th.

Ergonomics

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In case of a sudden change of weather, the M4 has a standard remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. On a hot day the M4 has a standard remote opening feature, to lower the top from outside. The AMG SL doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

Model Availability

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The BMW M4 comes in coupe and convertible bodystyles; the Mercedes AMG SL isn’t available as a coupe.

The M4 is available in both rear-wheel drive and all-wheel drive configurations. The AMG SL doesn’t offer a two-wheel drive configuration.

Recommendations

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The 4 Series was chosen as one of Car and Driver’s “Top Ten” in 2014. The AMG SL has never been a Car and Driver “Top Ten” pick.

The M3/M4 was chosen as one of Automobile Magazine’s “All Stars” for 13 of the last 26 years. The AMG SL has never been an “All Star.”

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