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2024 Mercedes-AMG SL-class vs BMW 8-Series: Which is Better?
The Mercedes-AMG SL-class smoothly blends luxury and performance in a striking convertible, leaning more towards performance while still attracting traditional luxury fans. The latest SL now has a two-plus-two setup, but the back seats are better for storing things than carrying passengers. Offering three power choices, from a turbo four-cylinder in the SL43 to a strong V-8 in the SL55 and an impressive V8 in the SL63, it gives various performance options. On the other hand, the BMW 8-series coupe and convertible, rare in today’s car scene, blend a classy look with well-balanced driving dynamics. You can pick between a turbo inline-six or an optional twin-turbo V8. Both models focus on comfort with high-quality materials and roomy front seats, though the back is a bit tight for taller folks. But, compared to rivals like the Mercedes-AMG SL-class and Lexus LC, it offers more room in the rear seats.
| Mercedes-AMG SL-class | BMW 8-Series | |
| Dimensions | 185.2 in x 75.4 in x 53.5 in | 191.2 in x 74.9 in x 53.0 in |
| Engine | 4.0L twin-turbocharged V8 | 4.4L twin-turbocharged V8 |
| Horsepower | 577 hp | 523 hp |
| Torque | 590 lb-ft | 553 lb-ft |
| 0-60 MPH | 3.0 sec | 3.3 sec |
| 0-100 MPH | 7.1 sec | 7.6 sec |
| Top-Speed | 196 mph | 159 mph |
Mercedes-AMG SL-class
Engine & Performance
Except for the entry-level SL43, featuring a 375-hp turbocharged 2.0L inline-four, the SL models derive power from a twin-turbo 4.0L V8 sourced from the GT sports car. The SL55 boasts a robust 469 hp while upgrading to the SL63 elevates that figure to an impressive 577 hp. Solely equipped with a nine-speed automatic transmission, the SL55 and SL63 feature standard AWD and four-wheel steering, whereas the SL43 is exclusive RWD. At the peak of power, the SL63 S E Performance takes centre stage as a plug-in hybrid, coupled with a twin-turbo V8 with an electric motor for an astonishing 805 hp.
Price & Mileage
The anticipated starting price for the Mercedes-AMG SL-Class is approximately $111,000 for the SL43, escalating to $200,000 for the SL63 S E Performance. All SL models boast an array of standard luxury features, encompassing massaging seats, a head-up display, and a Burmester stereo system. Opting for the pricier SL63 unleashes the full potential of the twin-turbo V8. Fuel efficiency estimates reveal the SL55 at 14 mpg city and 22 mpg highway, with the more potent SL63 slightly lower at 13 mpg city and 21 mpg highway. The SL43 offers notably better estimates at 21 mpg city and 27 mpg highway.
Acceleration & Features
During testing, the SL63 impressively accelerated to 60 mph in a mere 3.0 seconds, accompanied by a distinctive exhaust note. Although the SL55 hasn’t undergone testing, the base SL43 demonstrated a respectable 0-60 mph time of 4.5 seconds on the track. According to AMG, the high-powered SL63 S E Performance, boasting 805 hp, can achieve the 0-60 mph sprint in as little as 2.8 seconds. All SL models feature Mercedes’s latest MBUX infotainment system, including the “Hey Mercedes” virtual assistant and an expansive 11.9-inch touchscreen display. Standard equipment includes a 12.3-inch digital gauge display, Apple CarPlay, Android Auto, and a navigation system with available augmented reality. The SL lineup is equipped with a Burmester stereo system, with the SL63 offering an optional upgraded surround-sound version.
BMW 8-Series
Engine & Performance
BMW’s largest coupe and convertible kick off with a 335-hp turbocharged inline-six-cylinder engine. These 840i models come with an eight-speed automatic transmission and are available with either RWD or AWD. BMW is known for its smooth and responsive powertrains, so only those obsessed with speed might be a bit let down. Both the coupe and convertible versions of the M850i boast a 523-hp twin-turbo V8 and an eight-speed automatic transmission, and come standard with AWD. This combo delivers impressive acceleration for the size of the Bimmer and produces a satisfying soundtrack in the sportiest setting.
Price & Mileage
The BMW 8-series starts at $90,395 for the 840i coupe and climbs to $115,295 for the M850i Convertible. We lean towards the robust power of the AWD exclusive M850i, equipped with its 523-hp twin-turbo V8. The beefier M850i, featuring a twin-turbo V8 and standard AWD, does come with a notable dip in EPA fuel-economy ratings compared to the turbo six-cylinder in the 840i models. The M850i is rated at up to 17 mpg in the city and 25 on the highway, while the less powerful 840i boasts estimates of up to 23 mpg in the city and 30 on the highway.
Acceleration & Features
Crucially, the 8-series lives up to its grand-touring promises by providing an exceptionally quiet ride coupled with unexpected athleticism. The steering is precise and direct, offering a smooth driving experience that minimizes road imperfections and reduces front-tire feedback. While the adaptive dampers offer flexibility based on the chosen drive mode, their stiffest setting ensures remarkable stability during cornering. Standard features include a 12.3-inch digital gauge cluster and a 12.3-inch touchscreen. The infotainment system offers various interaction options, including a handy rotary knob on the center console. It also comes with standard Apple CarPlay, wireless charging, and a Wi-Fi hotspot, although Android Auto is not supported. Those desiring an upgraded sound system can choose the Bowers & Wilkins Diamond surround system.