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# The R231 Mercedes-Benz SL: A Comprehensive Buyer's Guide to a Modern Grand Tourer Icon (2012-2020)
For decades, the Mercedes-Benz SL-Class has epitomized the grand touring roadster: a perfect blend of exhilarating performance, opulent luxury, and timeless style. Among its illustrious lineage, the R231 generation, produced from 2012 to 2020, stands out as a particularly compelling chapter. Lighter, more technologically advanced, and boasting an incredible range of powertrains from the efficient SL350 to the monstrous SL65 AMG, the R231 represents a significant evolution in the SL story.
Now, as these vehicles transition into the pre-owned market, they offer an enticing proposition for enthusiasts and luxury car buyers alike. This article delves into the R231's legacy, explores its diverse model range, and provides a comprehensive buyer's guide, updated for the current market in September 2022, to help you navigate the journey of owning this modern classic.
The R231's Design & Engineering Philosophy: A Leap Forward
The R231 generation marked a deliberate shift for the SL, aiming for a more dynamic and efficient package compared to its R230 predecessor. Mercedes-Benz engineers focused on shedding weight and integrating advanced technologies, all while preserving the iconic SL aesthetic.
A Lighter, More Agile SL
One of the R231's most significant advancements was its largely aluminum body shell. This innovative construction resulted in a substantial weight reduction (up to 140 kg or 308 lbs compared to the R230), directly translating into improved fuel economy, enhanced agility, and more responsive handling. This wasn't just a design tweak; it was a fundamental engineering decision that redefined the SL's driving dynamics.
Retractable Hardtop Evolution
The signature retractable vario-roof was refined for the R231, offering quicker operation and, in some models, the revolutionary "Magic Sky Control." This optional feature allowed drivers to switch the panoramic glass roof from light to dark with the touch of a button, providing an open-air feel even with the roof closed, or instant shade when desired – a true testament to Mercedes-Benz's luxury innovation.
Interior Sophistication and Technology
Inside, the R231 offered a cabin that blended traditional Mercedes-Benz luxury with contemporary technology. High-quality materials, meticulous craftsmanship, and comfortable, supportive seats were standard. The COMAND infotainment system, while dating back to its era, provided navigation, audio, and connectivity features. Innovations like the Frontbass system, which used cavities in the aluminum structure as resonance chambers for bass speakers, underscored the attention to detail in creating a premium acoustic experience.
Powering the R231: From V6 to V12 Dominance
The R231's powertrain lineup was remarkably diverse, catering to a wide spectrum of preferences, from refined cruising to outright supercar-baiting performance.
The Foundation: SL350 & SL400
The journey began with the six-cylinder models. The **SL350** (pre-facelift) featured a naturally aspirated 3.5-liter V6, offering smooth, adequate power for relaxed cruising and daily driving. Post-facelift, the **SL400** introduced a twin-turbocharged 3.0-liter V6, significantly boosting torque and performance while maintaining impressive efficiency. These V6 models represent an excellent entry point into R231 ownership, offering the SL experience with lower running costs.
V8 Grandeur: SL500/SL550
Stepping up, the **SL500** (known as SL550 in North America) was powered by a potent 4.7-liter twin-turbocharged V8 engine (M278). This engine transformed the SL into a true grand tourer, delivering effortless acceleration and a captivating V8 rumble. It strikes an ideal balance between performance, luxury, and day-to-day usability, making it a popular choice.
The AMG Beasts: SL63 & SL65
For those craving ultimate performance, the AMG variants were the pinnacle.
- **SL63 AMG:** Initially powered by a 5.5-liter twin-turbo V8 (M157), and later (post-facelift) by a 4.0-liter twin-turbo V8, the SL63 was a force of nature. It offered blistering acceleration, a more aggressive stance, and a sport-tuned chassis designed for spirited driving, albeit still with a luxurious edge.
- **SL65 AMG:** The undisputed king of the R231 range, the SL65 AMG housed a magnificent 6.0-liter twin-turbo V12 engine (M279). Producing immense power and torque, the SL65 was a true luxury missile. It was less about track times and more about effortless, relentless acceleration and exclusivity, representing the last V12-powered SL with a folding hardtop – a significant collector's item.
The R231 Buyer's Guide: What to Look For (Updated for Sept. 2022)
As the R231 ages, understanding its potential quirks and maintenance requirements is crucial for a smooth ownership experience.
Engine Variants & Your Driving Style
- **SL350/SL400:** Ideal for those prioritizing comfort, efficiency, and lower running costs. Perfect for elegant cruising.
- **SL500/SL550:** The sweet spot for many. Excellent power, luxurious feel, and still relatively manageable maintenance compared to AMGs.
- **SL63 AMG:** For the performance enthusiast who wants a powerful, engaging drive. Be prepared for higher fuel, tire, and brake costs.
- **SL65 AMG:** A collector's car and ultimate luxury statement. Exclusivity comes with significantly higher running and repair costs for its complex V12.
Key Inspection Points
1. **Service History:** Non-negotiable. A complete, documented service history from Mercedes-Benz dealerships or reputable specialists is paramount, especially for AMG models. Look for evidence of timely oil changes, transmission fluid services, and spark plug replacements. 2. **Retractable Hardtop:** Operate the roof multiple times. Listen for unusual noises, check for smooth operation, and inspect all seals for cracks or leaks. Repairing roof mechanisms can be costly. 3. **Suspension System:**- **ABC (Active Body Control):** If fitted (optional on non-AMG, standard on SL65, optional on SL63), carefully check for warning lights, leaks around the struts, or any sagging when parked. ABC repairs can be extremely expensive.
- **AIRMATIC (Air Suspension):** Some models had air suspension. Check for similar issues.
- **Standard Coil Springs/Adaptive Dampers:** Most R231s had this setup. Simpler, but still check for worn bushings or damper leaks.
Running Costs & Maintenance
- **Fuel Economy:** Varies wildly. V6 models are reasonable; V8s are thirsty; V12s are exceptionally thirsty.
- **Insurance:** Can be high, especially for AMG models, due to their value and performance.
- **Parts & Labor:** Mercedes-Benz parts are premium. AMG-specific components are even more so. Find a trusted independent Mercedes specialist if you don't want to rely solely on dealerships.
- **Tires:** AMG models require specific high-performance tires, which are costly.
- **Fluids:** Regular maintenance includes specific Mercedes-approved fluids, which can be expensive.
Pre-Facelift vs. Facelift (2016 Onwards)
The 2016 facelift brought significant updates. Visually, the facelift models received a redesigned front grille, headlights, and bumpers. Mechanically, the non-AMG models benefited from Mercedes' excellent 9G-Tronic automatic transmission, offering smoother shifts and improved efficiency. The COMAND system also received an update. While pre-facelift models offer great value, the facelift cars provide a more modern driving and ownership experience.
Conclusion: The R231 SL's Enduring Appeal
The Mercedes-Benz R231 SL series, from the refined SL350 to the majestic SL65 AMG, represents a compelling chapter in the history of grand touring roadsters. It masterfully blends cutting-edge engineering, luxurious comfort, and captivating performance in a package that remains highly desirable today. As the last generation of SL with a folding hardtop and the final V12 SL, its place as a modern classic is assured.
For the discerning buyer, the R231 offers remarkable value in the used luxury market. Whether you seek a stylish cruiser or a brutal performance machine, there's an R231 SL for you. The key to a rewarding ownership experience lies in a thorough pre-purchase inspection, a detailed service history, and a clear understanding of the running costs associated with these sophisticated machines. Choose wisely, and the R231 SL will deliver years of open-top motoring pleasure, embodying the true spirit of Mercedes-Benz.
