The Mercedes-Benz SL (R231) AMG SL 63, produced from 2012 to 2015, represents the high-performance pinnacle of the sixth-generation SL roadster. Positioned as the flagship model within the R231 lineup, the SL 63 distinguished itself through its powerful AMG-tuned engine, enhanced suspension, and luxurious appointments. Built on the R231 platform, this iteration of the SL aimed to blend grand touring comfort with exhilarating performance, appealing to buyers seeking a sophisticated and capable open-top sports car. It served as a direct successor to the R230 SL 63, continuing the tradition of AMG-enhanced SL models.
AMG SL 63 Powertrain & Engine Architecture
At the heart of the SL 63 lies the M157.983 5.5-liter V8 engine, a hand-built powerplant developed by Mercedes-AMG. This engine is characterized by its twin-turbocharged configuration, featuring two exhaust gas turbochargers and an intercooler, delivering a substantial 537 horsepower at 5500 rpm and 800 Nm (590.05 lb-ft) of torque available from 2000 to 4500 rpm. The engine utilizes direct fuel injection, optimizing combustion efficiency and power delivery. The compression ratio is set at 10:1. The engine’s longitudinal front-mid engine layout contributes to balanced weight distribution. The M157 engine family is known for its robust construction and ability to withstand significant power upgrades.
The SL 63 is equipped with the AMG SPEEDSHIFT PLUS 7G-TRONIC automatic transmission. This seven-speed automatic transmission is specifically tuned for performance, offering quick and precise gear changes. It features three driving modes – Controlled Efficiency (C), Sport, and Manual – allowing the driver to tailor the transmission’s behavior to their preferences. Paddle shifters mounted on the steering wheel provide manual control over gear selection, enhancing driver engagement. The transmission is designed to handle the high torque output of the V8 engine, ensuring smooth and reliable operation.
Fuel Injection and Valvetrain
The M157 engine employs a sophisticated direct injection system, injecting fuel directly into the combustion chamber at high pressure. This technology improves fuel atomization, leading to more complete combustion and increased power output. The engine also features a multi-spark ignition system, ensuring reliable ignition even under demanding conditions. The valvetrain utilizes four valves per cylinder, optimized for efficient airflow and high-revving performance. Variable valve timing on both the intake and exhaust sides further enhances engine flexibility and responsiveness.
Driving Characteristics
The AMG SL 63 delivers a thrilling driving experience characterized by its potent acceleration and confident handling. The 0 to 60 mph sprint is achieved in approximately 4.1 seconds, while 0-100 km/h takes 4.3 seconds. Top speed is electronically limited to 155.34 mph (250 km/h). The twin-turbocharged V8 provides a broad torque curve, resulting in strong acceleration throughout the rev range. The AMG SPEEDSHIFT transmission contributes to seamless gear changes, minimizing interruption to the power delivery.
Compared to lower-powered SL variants, such as the SL 350 or SL 550, the SL 63 offers a significantly more aggressive and engaging driving experience. While the SL 350 and SL 550 prioritize comfort and fuel efficiency, the SL 63 is focused on performance. The SL 63’s suspension is tuned for greater responsiveness and control, providing a more connected feel to the road. Compared to a potential manual transmission variant (which was not offered), the SPEEDSHIFT transmission provides very quick shifts, minimizing any performance disadvantage.
Equipment & Trim Levels
The SL 63 came standard with a comprehensive array of luxury and performance features. Interior appointments included premium leather upholstery, AMG sport seats with enhanced bolstering, and carbon fiber trim. Standard equipment also included a multi-function steering wheel, a high-resolution infotainment system with navigation, and a premium sound system. The SL 63 also featured an automatic retractable hardtop, providing both open-air driving enjoyment and coupe-like security and refinement.
Optional extras included features such as the Distronic Plus adaptive cruise control, Lane Keeping Assist, and a panoramic sunroof. Exterior options included a variety of wheel designs, paint colors, and aerodynamic enhancements. The SL 63 was positioned as the top-of-the-line SL model, and as such, offered a higher level of standard equipment and customization options compared to other trims.
Chassis & Braking
The SL 63 features a fully independent multi-link suspension system at both the front and rear, optimized for handling and ride comfort. The suspension is electronically controlled, allowing the driver to adjust the damping characteristics to suit their preferences. The chassis is constructed from a combination of aluminum and steel, providing a balance of rigidity and weight savings.
Braking duties are handled by ventilated discs at all four corners, equipped with AMG-branded calipers. The anti-lock braking system (ABS) and electronic stability control (ESC) systems provide enhanced safety and control. The SL 63’s braking system is designed to withstand the demands of high-performance driving, delivering consistent stopping power even under repeated use. The steering system utilizes a power-assisted rack and pinion setup, providing precise and responsive steering feel.
Market Reception & Comparison
The Mercedes-Benz SL 63 was generally well-received by automotive critics, who praised its powerful engine, refined handling, and luxurious interior. Reviewers noted the car’s ability to deliver both exhilarating performance and comfortable grand touring capabilities. However, some critics pointed to the car’s relatively high price and fuel consumption as potential drawbacks.
Compared to other high-performance roadsters of the time, such as the Porsche 911 Turbo and the BMW M6, the SL 63 offered a unique blend of luxury and performance. While the Porsche 911 Turbo prioritized outright performance, the SL 63 emphasized comfort and refinement. The SL 63’s fuel economy, at 9.9 l/100 km (23.8 US mpg), was comparable to other vehicles in its class, but still relatively high due to the engine’s size and power output. Reliability was generally good, although the complex twin-turbocharged engine required regular maintenance.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | SL |
| Generation | SL (R231) |
| Type | AMG SL 63 (537 Hp) SPEEDSHIFT |
| Start of production | 2012 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (urban) | 13.9 l/100 km (16.9 US mpg) |
| Fuel consumption (extra urban) | 7.6 l/100 km (30.9 US mpg) |
| Fuel consumption (combined) | 9.9 l/100 km (23.8 US mpg) |
| CO2 emissions | 231 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.3 sec |
| Acceleration 0 – 62 mph | 4.3 sec |
| Acceleration 0 – 60 mph | 4.1 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 3.4 kg/Hp |
| Weight-to-torque ratio | 2.3 kg/Nm |
| Power | 537 Hp @ 5500 rpm |
| Torque | 800 Nm @ 2000-4500 rpm (590.05 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 157.983 |
| Engine displacement | 5461 cm3 (333.25 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Compression ratio | 10:1 |
| Fuel injection system | Direct injection |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Kerb Weight | 1845 kg (4067.53 lbs.) |
| Max. weight | 2180 kg (4806.08 lbs.) |
| Max load | 335 kg (738.55 lbs.) |
| Trunk (boot) space – minimum | 241 l (8.51 cu. ft.) |
| Trunk (boot) space – maximum | 381 l (13.45 cu. ft.) |
| Fuel tank capacity | 75 l (19.81 US gal | 16.5 UK gal) |
| Length | 4617 mm (181.77 in.) |
| Width | 1877 mm (73.9 in.) |
| Height | 1315 mm (51.77 in.) |
| Wheelbase | 2585 mm (101.77 in.) |
| Tires size | 255/35 ZR19; 285/30 ZR19 |
Legacy
The AMG SL 63 (R231) remains a desirable vehicle in the used car market, appreciated for its combination of performance, luxury, and exclusivity. The M157 engine, while complex, has proven to be relatively durable with proper maintenance. Common maintenance items include regular oil changes, spark plug replacements, and inspection of the turbochargers. The SPEEDSHIFT transmission is also generally reliable, but may require servicing over time. The R231 SL 63 represents a high point in the SL lineage, offering a compelling blend of grand touring comfort and exhilarating performance that continues to appeal to enthusiasts today.
