2012-2015 Mercedes-Benz SL (R231) AMG SL 65 (630 Hp) SPEEDSHIFT

The Mercedes-Benz SL (R231) AMG SL 65, produced from 2012 to 2015, represents the pinnacle of performance within the R231 SL-Class generation. This high-performance roadster was positioned as the flagship model, offering significantly more power and luxury than the SL 350, SL 550, and other variants. Built on the R231 platform, the SL 65 aimed to deliver an uncompromising grand touring experience, blending exhilarating speed with Mercedes-Benz’s renowned comfort and refinement. It was a direct successor to the R230 SL 65 AMG, continuing a tradition of V12-powered SL models.

Powertrain & Engine Architecture

The heart of the AMG SL 65 is the M279.981 6.0-liter V12 engine. This engine is a longitudinally-mounted, twin-turbocharged powerplant, producing 630 horsepower at 4800 rpm and a massive 1000 Nm (737.56 lb-ft) of torque available from 2300 to 4300 rpm. The engine utilizes multi-port fuel injection and features an intercooler to manage intake air temperatures. The compression ratio is set at 9:1. The engine’s architecture is notable for its aluminum engine block and heads, contributing to a relatively lightweight construction for a V12.

The “SPEEDSHIFT” transmission refers to the AMG SPEEDSHIFT PLUS 7G-TRONIC automatic transmission. This seven-speed automatic is specifically tuned for performance, offering quick and precise shifts. 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 are included, providing manual control over gear selection. The transmission is designed to handle the immense torque output of the V12 engine, ensuring smooth and reliable power delivery.

Engine Specifications

The M279.981 engine boasts a power-to-liter ratio of 105.4 hp/liter. It requires 10 liters (10.57 US quarts or 8.8 UK quarts) of engine oil, adhering to specific Mercedes-Benz oil specifications. The engine’s design incorporates advanced materials and technologies to maximize efficiency and durability, despite its high output.

Driving Characteristics

The AMG SL 65 delivers breathtaking acceleration. It can sprint from 0 to 100 km/h (0-62 mph) in just 4 seconds, and 0 to 60 mph in a calculated 3.8 seconds. Its top speed is electronically limited to 250 km/h (155.34 mph). The twin-turbochargers provide instant response and eliminate turbo lag, resulting in a surge of power throughout the rev range. The SPEEDSHIFT transmission contributes to the car’s dynamic performance, allowing for rapid gear changes during both acceleration and deceleration.

Compared to the naturally aspirated SL 550, the SL 65 offers a significantly more potent driving experience. While the SL 550 prioritizes smooth power delivery and refinement, the SL 65 is focused on raw performance. The SL 65’s heavier weight (1950 kg / 4299.01 lbs) is noticeable, but the immense torque output more than compensates for it. The rear-wheel-drive configuration provides a traditional sports car feel, with excellent traction and handling characteristics.

Equipment & Trim Levels

As the range-topping model, the AMG SL 65 came standard with a comprehensive list of features. The interior typically featured premium leather upholstery, AMG sport seats, and carbon fiber trim. Standard equipment included a multi-function steering wheel, a high-end audio system, automatic climate control, and a power-retractable hardtop.

Optional extras included features such as the Distronic Plus adaptive cruise control, the Premium Package (including features like the Airscarf neck-warming system and active body control suspension), and various customization options for the interior and exterior. The SL 65 was often ordered with bespoke paint colors and interior finishes, reflecting its status as a luxury performance vehicle.

Chassis & Braking

The SL 65 utilizes an independent multi-link suspension system at both the front and rear, providing a comfortable yet controlled ride. The suspension is tuned to complement the car’s high-performance capabilities, minimizing body roll and maximizing grip. Ventilated disc brakes are fitted on all four wheels, providing ample stopping power. The braking system is enhanced by ABS (Anti-lock Braking System) for improved stability and control. The steering system is a rack and pinion type with electric power steering, offering precise and responsive handling. The vehicle is equipped with 255/35 ZR19 tires at the front and 285/30 ZR19 tires at the rear, mounted on 19-inch alloy wheels.

Market Reception & Comparison

The AMG SL 65 was generally well-received by automotive critics, who praised its exceptional performance, luxurious interior, and advanced technology. However, some reviewers noted its high price tag and substantial weight. Compared to other high-performance roadsters of the time, such as the Porsche 911 Turbo, the SL 65 offered a more comfortable and refined driving experience, albeit with slightly less agility.

Fuel economy figures are 17 l/100 km (13.8 US mpg / 16.6 UK mpg / 5.9 km/l) in urban conditions, 8.4 l/100 km (28 US mpg / 33.6 UK mpg / 11.9 km/l) extra urban, and 11.6 l/100 km (20.3 US mpg / 24.4 UK mpg / 8.6 km/l) combined. CO2 emissions are rated at 270 g/km, meeting Euro 5 emission standards. Reliability reports suggest that the M279 engine is generally robust, but maintenance costs can be high due to the complexity of the engine and the cost of replacement parts.

Technical Specifications

Legacy

The AMG SL 65 (R231) remains a desirable vehicle in the used car market, particularly among enthusiasts seeking a high-performance luxury roadster. While maintenance costs can be significant, the car’s robust engine and well-engineered chassis contribute to its long-term reliability. The M279 V12 engine is considered a masterpiece of engineering, and the SL 65 represents a fitting end to the V12 SL lineage. The car’s combination of power, luxury, and exclusivity ensures its continued appeal to collectors and discerning drivers alike. The R231 SL 65 stands as a testament to Mercedes-Benz’s commitment to building exceptional grand tourers.