2021 Mercedes-Benz SL: Advanced Luxury Features

The 2021 Mercedes-Benz SL continues the legacy of a grand touring icon, merging timeless elegance with cutting-edge innovation. As a luxury roadster, it showcases a masterful balance between performance and comfort, offering drivers an exhilarating yet refined experience. With a lightweight structure, advanced powertrain technology, and an interior built for sophistication, the SL represents Mercedes-Benz’s dedication to craftsmanship and innovation. In this review, we take a deep dive into the updates, performance, comfort, and the driving character that define this modern classic.

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What’s New in the 2021 Mercedes-Benz SL: Design and Platform Updates

The 2021 Mercedes-Benz SL enters a new era, redefining the iconic SL formula with a completely reengineered platform, enhanced body rigidity, and a fresh design language that balances sportiness and sophistication. Unlike its predecessor, the 2021 SL is developed under the AMG Performance Division, marking a shift toward a more dynamic, performance-oriented identity. The car’s lightweight structure and advanced aluminum space frame set new standards for grand touring excellence while improving both agility and comfort.

Design Evolution and Exterior Details

The exterior of the 2021 SL blends heritage with innovation. Mercedes-Benz has refined the proportions to emphasize a longer hood, a shorter rear deck, and a more athletic stance. The Panamericana grille, with its vertical chrome slats, underscores the car’s connection to the AMG GT lineage, while new multibeam LED headlamps and slim taillights bring a modern, high-tech aesthetic. The design achieves a delicate balance between timeless elegance and modern aggression—an evolution rather than a revolution, yet instantly recognizable as an SL.

Aerodynamics also receive significant attention. The car integrates active air flaps in the front bumper and a deployable rear spoiler, both designed to optimize downforce and reduce drag at higher speeds. The result is a vehicle that not only looks stunning but performs with remarkable stability at highway velocities.

Platform and Engineering Highlights

Built on the new MSA (Modular Sports Architecture) platform, the 2021 SL shares structural DNA with the AMG GT, improving rigidity by more than 50% compared to the previous generation. This architecture allows a lower center of gravity, near-perfect weight distribution, and the flexibility to accommodate 4MATIC+ all-wheel drive for the first time in SL history.

Component	2021 Mercedes-Benz SL	Previous Generation (R231)
Platform	New MSA (AMG-derived)	R231 Aluminum Space Frame
Drivetrain	4MATIC+ AWD	Rear-Wheel Drive only
Body Rigidity	+50% improvement	Baseline
Roof Type	Fabric soft-top (lightweight)	Folding hardtop
Aerodynamics	Active flaps, adaptive spoiler	Fixed elements

Replacing the heavy folding metal roof with a lightweight fabric soft-top also contributes to a lower overall mass and a reduced center of gravity. This enhances both agility and ride comfort while allowing for a more traditional roadster silhouette.

Highlights

• Developed entirely by Mercedes-AMG, emphasizing performance DNA
• New fabric roof design saves approximately 21 kg compared to the old hardtop
• Reengineered chassis and suspension geometry improve handling precision
• Revised aerodynamic profile ensures stability at high speeds
• Updated lighting and grille design connect visually to the AMG GT series

Overall, the 2021 Mercedes-Benz SL marks a turning point for the model line. It’s more than a luxury cruiser—it’s a technologically advanced sports tourer that embodies Mercedes-Benz’s engineering evolution.

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Engine Options and Real-World Performance Review

The 2021 Mercedes-Benz SL offers a thrilling blend of performance and refinement, powered exclusively by AMG-engineered powertrains. Under the hood, the SL combines high-output V8 engines with state-of-the-art technologies to deliver smooth yet forceful acceleration, ensuring that every drive feels both exhilarating and effortless. With 4MATIC+ all-wheel drive available for the first time, power delivery is more precise and stable than ever, making the SL equally confident on winding roads and open highways.

Powertrain Variants and Specifications

Two main configurations were initially offered: the SL 55 4MATIC+ and the more potent SL 63 4MATIC+. Both use the hand-built AMG 4.0-liter twin-turbocharged V8 (M177 engine), known for its robust mid-range torque and smooth linear powerband. These engines are paired with the AMG SPEEDSHIFT MCT 9-speed transmission, ensuring rapid gear changes and instant throttle response.

Variant	Engine Type	Power Output	Torque	Transmission	Drivetrain
SL 55 4MATIC+	4.0L V8 Biturbo (M177)	469 hp	700 Nm	9G SPEEDSHIFT MCT	4MATIC+ AWD
SL 63 4MATIC+	4.0L V8 Biturbo (M177)	577 hp	800 Nm	9G SPEEDSHIFT MCT	4MATIC+ AWD

The V8 Biturbo unit features twin-scroll turbochargers positioned inside the “hot inside V” configuration—an engineering layout that shortens airflow paths and improves throttle response. This ensures minimal turbo lag and near-instantaneous acceleration.

In real-world testing, the SL 63 4MATIC+ accelerates from 0–100 km/h in just about 3.6 seconds, while the SL 55 completes the sprint in roughly 3.9 seconds. These figures place the SL among the fastest grand tourers in its class, rivaling high-performance icons like the Porsche 911 Carrera 4S and the Aston Martin Vantage Roadster.

Real-World Performance and Driving Feel

Beyond the raw numbers, what distinguishes the 2021 SL is its everyday usability. The AMG DYNAMIC SELECT system allows drivers to switch between modes such as Comfort, Sport, Sport+, and Race, each altering throttle mapping, suspension damping, and exhaust valve acoustics. The 4MATIC+ system can send up to 100% of torque to the rear wheels, preserving the roadster’s rear-biased handling feel while ensuring all-weather capability.

Highlights

• Handcrafted AMG 4.0L V8 Biturbo with direct injection and dry-sump lubrication
• 9-speed AMG SPEEDSHIFT MCT enables lightning-fast gear transitions
• 4MATIC+ AWD improves traction and stability in varied conditions
• Active exhaust system with adaptive flaps for tunable sound
• Remarkable performance-to-comfort balance in real-world driving

In essence, the 2021 Mercedes-Benz SL doesn’t just accelerate quickly—it delivers controlled, confident power across every driving situation, blending the heritage of grand touring with the soul of a true performance machine.

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Driving Dynamics and Handling Precision

The 2021 Mercedes-Benz SL redefines the concept of a grand touring roadster by merging comfort, agility, and precision handling. Developed entirely by Mercedes-AMG, the new SL is not merely a luxury cruiser—it’s a performance-focused machine capable of adapting to every driving condition. Its lightweight MSA platform, combined with AMG-tuned suspension systems, makes it one of the most dynamically balanced SLs ever built.

Chassis and Suspension Engineering

At the heart of the SL’s driving excellence lies a newly designed multi-link suspension featuring adaptive damping technology. This system constantly adjusts to road conditions and driving style, offering a perfect blend of ride comfort and responsiveness. The AMG ACTIVE RIDE CONTROL suspension replaces traditional anti-roll bars with hydraulically interlinked dampers, reducing body roll while maintaining a plush ride.

Complementing the chassis is the rear-axle steering system, which enhances both stability and maneuverability. At low speeds, the rear wheels turn in the opposite direction to the fronts for tighter cornering; at higher speeds, they turn in the same direction to ensure high-speed composure. This engineering approach not only improves handling agility but also delivers a sense of connection rare in luxury convertibles.

Driving Feature	Technology	Purpose
Suspension System	AMG ACTIVE RIDE CONTROL	Reduces roll, improves corner stability
Steering System	Rear-Axle Steering	Enhances agility and stability
Differential	Electronically controlled limited-slip differential	Optimizes traction in dynamic maneuvers
Drivetrain	4MATIC+ Variable AWD	Rear-biased handling with adaptive torque split
Drive Modes	AMG DYNAMIC SELECT (5 modes)	Customizes throttle, damping, and steering

On-Road Character and Handling Feel

In real-world conditions, the SL feels remarkably composed. The steering is sharp and communicative, giving the driver an immediate sense of control. The 4MATIC+ system ensures that power is distributed intelligently, maintaining traction even on challenging surfaces without diluting the classic rear-drive sensation. The chassis remains neutral through corners, inspiring confidence at both spirited and relaxed paces.

Drivers can choose between modes—Comfort, Sport, Sport+, Race, and Individual—each transforming the car’s character. In Comfort, the SL glides smoothly over imperfections; in Sport or Race, throttle response sharpens, gear shifts quicken, and the AMG exhaust system delivers a deeper, more assertive tone.

Highlights

• Lightweight MSA platform ensures balanced weight distribution
• Active damping maintains composure during dynamic cornering
• Rear-axle steering provides unmatched agility for a grand tourer
• Optional carbon-ceramic brakes deliver fade-free stopping power
• Drive modes personalize the experience from luxury cruiser to performance roadster

Ultimately, the 2021 SL combines everyday usability with track-level precision—a roadster that behaves like a GT car but drives like a true AMG sports machine.

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Interior Craftsmanship, Comfort, and Materials

The 2021 Mercedes-Benz SL continues the brand’s tradition of exceptional interior quality, merging modern technology, luxury materials, and ergonomic design into a cohesive cabin experience. Developed entirely by Mercedes-AMG, the SL’s interior blends the emotional appeal of a classic roadster with the precision and innovation of a modern cockpit. It’s both a luxurious sanctuary and a high-tech performance space, engineered to satisfy drivers who demand refinement and engagement in equal measure.

Cabin Design Philosophy

The cabin of the 2021 SL is built around the driver, inspired by aviation-style layouts and minimalist architecture. The low seating position, wide center console, and sculpted dashboard emphasize sportiness without sacrificing comfort. The 12.3-inch digital instrument cluster is fully configurable, while the 11.9-inch portrait-oriented central display features the latest MBUX infotainment system, angled toward the driver for optimal visibility and usability.

Craftsmanship is evident throughout the cabin. Hand-finished Nappa leather upholstery, real aluminum trim, and optional carbon fiber inserts contribute to a sense of bespoke luxury. Every control and surface is designed for tactile precision—from the knurled metal switches to the seamless integration of ambient lighting that can be customized in 64 colors.

Interior Element	Material/Feature	Purpose
Upholstery	Nappa Leather	Soft, durable, premium finish
Dashboard Trim	Aluminum / Carbon Fiber	Visual and tactile luxury
Central Display	11.9” MBUX Touchscreen	Driver-focused infotainment
Instrument Cluster	12.3” Digital Display	Configurable driving data
Seats	AMG Performance Seats with Massage	Enhanced comfort and support

Comfort and Practicality

The 2021 SL marks the return of a 2+2 seating configuration, offering small but usable rear seats for short trips or additional luggage space. Heated and ventilated front seats, along with AIRSCARF neck-level heating, ensure year-round usability even with the top down. The soft-top roof operates in just 15 seconds and can be raised or lowered at speeds up to 50 km/h, adding a layer of practicality to open-air driving.

Acoustic comfort has also improved thanks to advanced insulation in the fabric roof and acoustic glass windshield, reducing wind and road noise to near coupe levels. The cabin remains serene even at highway speeds, underscoring Mercedes-Benz’s dedication to long-distance refinement.

Highlights

• Driver-oriented cockpit with MBUX system and responsive controls
• High-quality materials and customizable interior themes
• AIRSCARF system and seat ventilation for all-season comfort
• 2+2 seating layout adds versatility
• Exceptional build quality aligned with Mercedes-AMG craftsmanship standards

In sum, the interior of the 2021 SL reflects a masterclass in modern luxury design—one that combines the brand’s legendary attention to detail with the emotional appeal of open-top grand touring.

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Safety Enhancements and Advanced Driver Assistance Systems

The 2021 Mercedes-Benz SL demonstrates how modern engineering can blend high performance with uncompromising safety. As one of the flagship convertibles in the Mercedes-AMG lineup, the SL benefits from the brand’s most advanced driver assistance systems, structural reinforcements, and intelligent safety technologies. Every component is designed to enhance protection, prevent accidents, and deliver driver confidence whether cruising at highway speeds or navigating city streets.

Structural Safety and Passive Protection

The 2021 SL’s MSA architecture (Modular Sports Architecture) provides exceptional rigidity and crash protection without unnecessary weight. The car’s aluminum space frame, reinforced with high-strength steel and composite materials, creates a protective safety cell that absorbs impact energy efficiently. The fabric soft-top has been engineered with integrated rollover protection, and the active pop-up roll bars deploy in milliseconds if sensors detect an imminent overturn.

Occupant safety is further enhanced by adaptive front airbags, side thorax airbags, and knee airbags for both driver and passenger. Seatbelt tensioners, PRE-SAFE® collision anticipation, and structural crumple zones work together to create a comprehensive passive safety suite.

Safety Feature	Type	Function
PRE-SAFE® System	Passive/Preventive	Prepares cabin for impact (tightens belts, adjusts seats)
Active Roll Bars	Passive	Deploy automatically during rollover risk
MULTIBEAM LED Headlights	Active	Adaptive beam pattern for optimal night visibility
ATTENTION ASSIST	Active	Detects driver fatigue and suggests rest
Crosswind Assist	Active	Stabilizes car in strong side winds

Advanced Driver Assistance and Automation

Mercedes-Benz has equipped the 2021 SL with a full suite of ADAS technologies (Advanced Driver Assistance Systems). The DISTRONIC PLUS adaptive cruise control maintains safe distances, while Active Lane Keeping Assist and Active Blind Spot Assist help prevent unintended lane departures and side collisions. Traffic Sign Assist reads road signs and displays speed limits on the digital cluster in real time.

Perhaps the most impressive is Active Brake Assist, which uses radar and camera data to detect vehicles, pedestrians, or cyclists, automatically applying the brakes when necessary. Together with Evasive Steering Assist, the SL provides intervention-level safety support while maintaining a natural driving feel.

Highlights

• MSA platform delivers high rigidity and optimized crash protection
• Comprehensive airbag suite including thorax and knee airbags
• Active Brake Assist and Evasive Steering Assist for collision avoidance
• PRE-SAFE® and ATTENTION ASSIST systems improve occupant readiness
• Optional 360° camera system enhances situational awareness

The safety strategy behind the 2021 SL reflects Mercedes-Benz’s core philosophy: to combine driving pleasure with unmatched protection. Whether experienced as a weekend roadster or a long-distance GT, the SL ensures its occupants enjoy both freedom and security in every journey.

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Infotainment and Connectivity Features Explained

The 2021 Mercedes-Benz SL blends high-performance engineering with a fully digital, connected cabin experience. As a product of Mercedes-AMG, this generation of SL showcases the brand’s most sophisticated infotainment and connectivity ecosystem, designed to enhance driver engagement, comfort, and convenience. Every system—from entertainment to navigation—operates through the latest generation of MBUX (Mercedes-Benz User Experience), seamlessly integrating intuitive controls and intelligent personalization.

MBUX Infotainment System

At the center of the interior lies an 11.9-inch touchscreen display, mounted in a portrait orientation and slightly tilted toward the driver. This display operates the MBUX operating system, which combines voice control, AI-driven learning, and touch responsiveness. The system recognizes natural speech patterns through the command “Hey Mercedes,” allowing the driver to control navigation, media, or climate settings without distraction.

The 12.3-inch digital instrument cluster complements the main screen, providing real-time data such as speed, navigation prompts, and AMG-specific performance metrics. It offers multiple themes—Classic, Sport, and Supersport—allowing customization according to the driver’s mood and environment.

Feature	Specification / Function	Purpose
MBUX Interface	AI-based multimedia system	Natural language and touch control
Digital Instrument Cluster	12.3-inch HD display	Customizable driving data views
Voice Assistant (“Hey Mercedes”)	Adaptive voice recognition	Hands-free operation
AR Navigation	Augmented reality overlays	Real-time visual route guidance
Wireless Connectivity	Apple CarPlay, Android Auto, Bluetooth	Seamless smartphone integration

Connectivity and Smart Integration

Beyond entertainment, the SL’s infotainment system acts as a digital command hub. The car offers 5G-capable telematics, over-the-air software updates, and Mercedes me Connect services for real-time vehicle monitoring and remote access. Drivers can check fuel status, lock or unlock doors, and locate the car via smartphone—all through a secure cloud connection.

The Burmester 3D surround sound system elevates the auditory experience with up to 17 speakers, a 730-watt amplifier, and a cabin-specific equalization profile. This setup transforms the SL’s cabin into an acoustic studio, perfectly tuned for open-top driving.

Infotainment Usability and Personalization

MBUX in the SL also supports driver profiles, storing seat position, climate settings, and ambient lighting preferences for each user. The head-up display (HUD) projects critical information directly onto the windshield, minimizing eye movement during spirited driving.

Additionally, the augmented reality navigation merges live camera views with digital overlays, projecting turn indicators directly onto the road in front of the driver. This fusion of real-world imagery and virtual data improves accuracy and reduces driver distraction.

Highlights

• MBUX system integrates touch, voice, and gesture control
• Augmented reality navigation enhances real-world guidance
• Burmester 3D sound system tailored for open-top acoustics
• Mercedes me Connect enables remote access and OTA updates
• Full smartphone integration via Apple CarPlay and Android Auto

In essence, the infotainment package of the 2021 Mercedes-Benz SL transforms luxury into intelligence—combining digital innovation with timeless elegance to create an environment that’s as connected as it is captivating.

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Fuel Efficiency and Real-World Economy Insights

The 2021 Mercedes-Benz SL may be engineered for performance, but Mercedes-AMG has refined its powertrains to balance power with efficiency. Thanks to advanced engine management systems, lightweight construction, and aerodynamic optimization, the SL delivers competitive fuel economy for a high-output V8-powered grand tourer. While outright economy isn’t the car’s primary focus, the improvements over previous generations are notable, making the SL more usable for long-distance touring without excessive fuel consumption.

Engine Efficiency and Technology

Both the SL 55 4MATIC+ and SL 63 4MATIC+ utilize the AMG 4.0-liter V8 Biturbo engine, but it’s the technology within these powertrains that truly enhances efficiency. The twin-scroll turbochargers, integrated within the “hot inside V” configuration, reduce energy loss and improve thermal efficiency. Additionally, cylinder deactivation (known as AMG Cylinder Management) allows the engine to temporarily shut down four cylinders under light load, reducing fuel use during cruising or low-speed driving.

Model	Engine Type	Combined Fuel Economy (approx.)	CO₂ Emissions (WLTP)
SL 55 4MATIC+	4.0L V8 Biturbo	~11.8 L/100 km	~270 g/km
SL 63 4MATIC+	4.0L V8 Biturbo	~12.3 L/100 km	~280 g/km

The 9-speed AMG SPEEDSHIFT MCT transmission also contributes to improved economy through optimized gear ratios and smoother torque delivery. At highway speeds, the transmission shifts into higher gears early, maintaining low RPM for quieter, more efficient cruising.

Aerodynamics and Lightweight Benefits

The 2021 SL’s lightweight soft-top design saves over 20 kg compared to the previous metal roof. Combined with the new MSA platform and active aerodynamics, drag is reduced, and airflow is managed more efficiently. These refinements help lower consumption during sustained highway driving, where aerodynamics play a significant role in overall efficiency.

Real-World Consumption Insights

In everyday use, drivers can expect fuel consumption figures close to the official data, especially when using Comfort mode and allowing the transmission’s adaptive logic to prioritize efficiency. However, in Sport+ or Race mode, consumption rises significantly due to sharper throttle mapping and higher rev operation. Long-distance touring on highways reveals the SL’s ability to maintain reasonable efficiency given its performance potential.

Highlights

• Cylinder deactivation technology enhances real-world fuel savings
• Lightweight construction and reduced drag improve long-range economy
• 9-speed AMG SPEEDSHIFT MCT provides efficient high-gear cruising
• Dynamic driving modes adjust throttle and shift behavior for optimal fuel use
• Aerodynamic efficiency contributes to both stability and lower consumption

Overall, the 2021 Mercedes-Benz SL manages to blend exhilarating V8 power with commendable fuel discipline—a rare achievement in the high-performance convertible segment.

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Dimensions, Storage, and Everyday Practicality

The 2021 Mercedes-Benz SL demonstrates that performance and practicality can coexist in a luxury grand tourer. While it is unmistakably a high-performance roadster, the 2021 SL has been engineered to offer daily usability, thoughtful storage solutions, and an ergonomic layout that enhances comfort on both short drives and long-distance journeys. Its reimagined proportions and efficient interior packaging make it more versatile than ever before.

Exterior Dimensions and Proportions

The SL retains its iconic long-hood, short-deck design while adopting new proportions optimized for aerodynamics and cabin space. The MSA platform allows a slightly wider track and longer wheelbase compared to its predecessor, improving both stability and passenger comfort.

Dimension	Measurement	Change vs. Previous Gen (R231)
Overall Length	4,705 mm	+75 mm
Width	1,915 mm	+45 mm
Height	1,350 mm	-20 mm
Wheelbase	2,700 mm	+115 mm
Curb Weight	~1,950 kg	-120 kg

The longer wheelbase enhances ride comfort and high-speed stability, while the reduced overall height contributes to a sportier stance and improved aerodynamics. Despite being larger, the SL feels more compact on the road due to rear-axle steering and improved visibility from the driver’s seat.

Cabin and Storage Solutions

A key advancement in the 2021 SL is its return to a 2+2 seating configuration, providing extra versatility for carrying passengers or additional luggage. The rear seats are best suited for small children or short trips, but when folded, they expand usable storage for soft bags or weekend gear.

The trunk capacity measures around 213 liters with the roof folded and up to 240 liters with the top closed. This is sufficient for medium-sized luggage, making the SL surprisingly functional for long weekend getaways. Inside the cabin, thoughtful details like cupholders, door storage bins, and a wireless charging tray help maintain practicality without compromising elegance.

Roof Mechanism and Everyday Usability

Replacing the old hardtop with a lightweight fabric soft-top brings multiple benefits. It operates in about 15 seconds and can be activated at speeds up to 50 km/h, providing quick adaptability to weather changes. The fabric construction also frees up trunk space and reduces overall vehicle mass, which enhances both agility and fuel efficiency.

The driving position is adjustable across a wide range, and visibility has been optimized through thin A-pillars and low dashboard placement, ensuring confidence in urban settings. Combined with the 4MATIC+ all-wheel-drive system, the SL feels manageable and secure even in less-than-ideal conditions.

Highlights

• Proportioned for balance: longer wheelbase, lower height, wider stance
• 2+2 seating layout improves flexibility and usability
• Soft-top roof improves trunk space and agility
• Smart cabin storage supports real-world practicality
• Enhanced visibility and seating ergonomics for daily comfort

While the SL remains a luxury sports car first and foremost, these design refinements make it one of the most practical convertibles in its class—an elegant GT built not only for performance but for real-life use.

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Common Problems and Reliability Overview

The 2021 Mercedes-Benz SL was developed under the Mercedes-AMG division with a strong emphasis on long-term reliability, structural durability, and reduced maintenance complexity. As the first SL to utilize the new MSA (Modular Sports Architecture) platform, it benefits from state-of-the-art engineering solutions and more robust component design compared to earlier models. While overall dependability is notably improved, potential owners and enthusiasts should still be aware of certain common issues and long-term maintenance considerations typical of high-performance convertibles.

Reliability Record and Build Quality

The 2021 SL has earned a solid reputation for build precision and component integrity. The use of high-strength aluminum in the chassis, along with improved electrical architecture, has minimized many of the electronic and mechanical issues found in earlier SL generations (such as R230 and early R231 models). The transition to a fabric soft-top roof has also simplified the mechanism, replacing the complex folding hardtop system that was historically prone to hydraulic leaks or actuator failures.

Category	Observed Reliability	Remarks
Engine & Drivetrain	Excellent	Hand-built AMG V8 Biturbo proven in multiple AMG models
Transmission	Very Good	9G SPEEDSHIFT MCT reliable with timely fluid changes
Electrical Systems	Improved	Simplified wiring reduces past error codes
Roof Mechanism	Reliable	Lightweight soft-top design eliminates hydraulic failures
Suspension & Brakes	Very Good	Adaptive systems durable but require professional calibration

Commonly Reported Issues

While the SL’s engineering is highly advanced, no vehicle is completely free from minor issues. Owners and testers have occasionally reported:

• Sensor calibration errors in early production units, often related to Active Ride Control or lane-keeping systems.
• Occasional software glitches in the MBUX infotainment system, typically resolved through software updates.
• Battery drain after extended periods of inactivity—common in vehicles with advanced electronic systems.
• Wear-related maintenance on carbon-ceramic brakes, which require specialized servicing but offer long lifespan under normal use.

These issues are generally non-critical and easily addressed during routine service intervals. The overall mechanical reliability remains strong, thanks to shared AMG components used in models like the AMG GT 4-Door and E63 S.

Long-Term Reliability Factors

The 2021 SL benefits from improved cooling systems, reinforced drivetrain mounts, and optimized electronics that reduce long-term fatigue. Mercedes-AMG’s rigorous testing—covering high-speed endurance runs and extreme climate validation—ensures that the SL can handle both performance driving and extended touring without compromise.

Highlights

• Proven AMG V8 Biturbo engine used across multiple reliable AMG platforms
• Simplified soft-top system increases long-term durability
• Active Ride Control and MBUX updates easily managed through service centers
• Excellent corrosion resistance due to all-aluminum bodywork
• Maintenance-sensitive components designed for longevity under proper care

In conclusion, the 2021 Mercedes-Benz SL stands as one of the most dependable SL generations ever produced. With proper maintenance and software updates, it promises years of high-performance motoring with minimal reliability concerns—a rare balance of excitement and engineering excellence.

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Maintenance Costs and Long-Term Ownership Experience

Owning the 2021 Mercedes-Benz SL is as much about the experience as it is about performance. Designed under the Mercedes-AMG umbrella, the SL combines supercar-grade engineering with the reliability and service infrastructure of a global luxury brand. Its maintenance routines, service intervals, and durability-oriented design ensure a smooth ownership journey—provided that regular servicing and software updates are followed diligently.

Routine Maintenance and Service Intervals

The SL’s AMG V8 Biturbo engine and 9G SPEEDSHIFT MCT transmission are robust, but they require precise maintenance to sustain their performance. Mercedes-Benz recommends scheduled servicing every 15,000 km or annually, depending on usage conditions. The maintenance plan typically includes oil and filter changes, transmission fluid inspection, brake fluid replacement, and system diagnostics for electronics and ADAS (Advanced Driver Assistance Systems) calibration.

Maintenance Item	Recommended Interval	Remarks
Engine Oil & Filter	Every 15,000 km / 12 months	Use Mercedes-approved 229.5 synthetic oil
Transmission Fluid	Every 60,000 km	Ensures smooth gear shifts and prevents clutch wear
Brake Fluid	Every 2 years	Maintains optimal brake pressure and pedal feel
Coolant System	Every 3 years	Prevents overheating and corrosion in aluminum block
Air Filters & Spark Plugs	Every 45,000 km	Sustains combustion efficiency
Software Updates (MBUX/ADAS)	As available	Improves performance and system reliability

Ownership Experience and Cost of Upkeep

In real-world terms, the SL’s maintenance costs are higher than average but align with other high-performance luxury convertibles. However, Mercedes-AMG’s shared component strategy with the AMG GT and E-Class AMG models helps contain costs compared to fully bespoke supercars. The AMG 4.0L V8 (M177) is known for its durability, with many units running well beyond 150,000 km when properly maintained.

The switch to a fabric soft-top roof reduces long-term maintenance expenses significantly, as it eliminates the complex hydraulic systems used in previous SL generations. The 4MATIC+ all-wheel-drive system is largely maintenance-free, relying on electronic torque distribution that requires only periodic inspection.

Long-Term Ownership Impressions

Owners praise the SL for combining supercar performance with daily drivability. The interior materials—Nappa leather, metal switchgear, and carbon fiber trim—show excellent long-term wear resistance when properly cared for. Many users report that, with consistent servicing and gentle driving during warm-up, the SL remains mechanically flawless even after years of use.

The AMG roadside assistance program and wide service network also contribute to a hassle-free ownership experience. Additionally, over-the-air software updates for MBUX and ADAS systems reduce the need for frequent workshop visits.

Highlights

• Predictable and well-defined maintenance schedule
• Long-lasting AMG V8 Biturbo with proven durability record
• Simplified soft-top mechanism reduces maintenance risk
• MBUX software updates improve longevity and system stability
• AMG-trained service centers ensure specialist support worldwide

In essence, the 2021 Mercedes-Benz SL offers a rewarding long-term ownership experience: the prestige of an AMG roadster paired with the reliability and serviceability of a modern Mercedes. Properly maintained, it remains both a collector’s piece and a reliable grand tourer for years to come.

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Frequently Asked Questions About the 2021 Mercedes-Benz SL

What engine options are available in the 2021 Mercedes-Benz SL?

The 2021 SL is offered exclusively with AMG 4.0-liter V8 Biturbo engines in two variants: the SL 55 4MATIC+ and the SL 63 4MATIC+. Both are hand-built under AMG’s “One Man, One Engine” philosophy, delivering 469 hp and 577 hp respectively. These powertrains combine exceptional responsiveness with long-term durability, ensuring high performance without compromising refinement.

How fast is the 2021 Mercedes-Benz SL?

Performance is a defining trait of the SL. The SL 63 4MATIC+ accelerates from 0–100 km/h in about 3.6 seconds, while the SL 55 completes it in approximately 3.9 seconds. Both models are electronically limited to 250 km/h, though optional AMG Driver’s Packages can increase this limit slightly.

Does the 2021 SL have all-wheel drive?

Yes. For the first time in its history, the SL comes standard with 4MATIC+ fully variable all-wheel drive. This system enhances traction and stability while preserving a rear-biased driving character, adapting torque distribution automatically between the front and rear axles.

What are the key interior features of the 2021 SL?

The cabin is dominated by MBUX infotainment, a 12.3-inch digital instrument cluster, and an 11.9-inch central touchscreen. High-quality materials such as Nappa leather, aluminum, and carbon fiber trim create a sophisticated, driver-focused environment. The 2+2 seating layout also adds practicality for occasional passengers or luggage.

Is the 2021 SL suitable for everyday driving?

Absolutely. Despite its performance credentials, the 2021 SL is designed as a grand tourer. Its adaptive suspension, soft-top roof, and advanced driver assistance systems make it easy to drive daily, even in urban conditions. The comfortable seating and quiet cabin further enhance its usability.

How reliable is the 2021 Mercedes-Benz SL?

Overall reliability is excellent. The simplified soft-top roof, durable AMG V8 engine, and upgraded electrical architecture reduce common faults seen in previous generations. Routine servicing and software updates are key to maintaining peak performance over time.

What are the common maintenance requirements?

Regular servicing includes oil and filter changes every 15,000 km, brake fluid replacement every two years, and transmission servicing every 60,000 km. Software updates for MBUX and ADAS systems should be applied when available to ensure smooth operation.

Does the 2021 SL have hybrid or electric assistance?

No, the 2021 SL does not feature hybridization. However, its AMG 4.0L V8 uses modern efficiency technologies such as cylinder deactivation and twin-scroll turbocharging, which help balance performance with respectable fuel economy.

How practical is the SL for long trips?

The SL excels as a grand tourer. The cabin offers supportive seating, refined ride comfort, and sufficient trunk space for weekend luggage. The AIRSCARF neck-heating system and ventilated seats make open-top touring enjoyable in any season.

What makes the 2021 SL different from its predecessors?

The 2021 SL is a complete reinvention—developed by Mercedes-AMG from the ground up. It introduces a new MSA platform, 4MATIC+ AWD, and a lightweight fabric roof. These upgrades make it lighter, more agile, and technologically superior compared to the R231 generation.