Both the Z4 and the AMG SL have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, driver alert monitors, available lane departure warning systems, blind spot warning systems, rear parking sensors and rear cross-path warning.
Compare the2023 BMW Z4VS 2023 Mercedes AMG SL
Safety
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Warranty
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The Z4’s corrosion warranty is 7 years longer than the AMG SL’s (12 vs. 5 years).
BMW pays for scheduled maintenance on the Z4 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 2023 Auto Issue reports that BMW vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks BMW third in overall reliability. Mercedes is ranked 24th.
Fuel Economy and Range
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On the EPA test cycle the Z4 gets better mileage than the AMG SL:
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|
|
|
MPG |
| Z4 |
|||
|
|
RWD |
2.0 turbo 4-cyl. |
25 city/33 hwy |
|
|
|
3.0 turbo 6-cyl. |
23 city/31 hwy |
| AMG SL |
|||
|
|
AWD |
63 4.0 turbo V8 |
14 city/22 hwy |
|
|
|
55 4.0 turbo V8 |
13 city/21 hwy |
Regenerative brakes improve the Z4’s fuel efficiency by converting inertia back into energy instead of wasting it. The AMG SL doesn’t offer a regenerative braking system.
Brakes and Stopping
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The Z4 stops shorter than the AMG SL:
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|
Z4 |
AMG SL |
|
| 70 to 0 MPH |
146 feet |
150 feet |
Car and Driver |
| 60 to 0 MPH |
99 feet |
107 feet |
Motor Trend |
Suspension and Handling
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For better maneuverability, the Z4’s turning circle is 4.7 feet tighter than the AMG SL’s (36 feet vs. 40.7 feet).
Chassis
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The BMW Z4 may be more efficient, handle and accelerate better because it weighs about 750 to 1000 pounds less than the Mercedes AMG SL.
The Z4 is 1 foot, 2.5 inches shorter than the AMG SL, making the Z4 easier to handle, maneuver and park in tight spaces.
Cargo Capacity
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The Z4 has a much larger trunk with its top down than the AMG SL with its top down (9.9 vs. 7.5 cubic feet). The Z4 has a much larger trunk than the AMG SL with its top up (9.9 vs. 8.5 cubic feet).
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.
Recommendations
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Consumer Reports® recommends the BMW Z4, based on reliability, safety and performance.