The Mercedes-Benz SLK (R171, facelift 2008) SLK 300 V6 represents a compelling entry point into the world of Mercedes-Benz performance and open-top motoring. Part of the second-generation SLK (R171) series, which debuted in 2004, this model received a significant facelift in 2008, refining its aesthetics and enhancing its mechanical capabilities. Produced from April 2009 to January 2011, the SLK 300 V6 distinguished itself with a robust V6 engine and, notably, the availability of a driver-focused manual transmission – a feature increasingly rare in the luxury roadster segment. This combination appealed to enthusiasts seeking a more connected and engaging driving experience.
The Mercedes-Benz SLK (R171, facelift 2008) SLK 300 V6: Overview
The SLK series, as a whole, has always been positioned as a more accessible luxury roadster within the Mercedes-Benz lineup. It offered the prestige and refinement associated with the brand, but in a smaller, more manageable package than the larger SL-Class. The R171 generation continued this tradition, introducing the innovative “vario-roof” – a retractable hardtop that allowed the car to transform from a coupe to a roadster with ease. The 2008 facelift brought subtle yet impactful changes to the exterior and interior, ensuring the SLK remained competitive in a segment populated by rivals like the BMW Z4 and Porsche Boxster. The SLK 300 V6, while not the range-topping model, provided a sweet spot between performance, refinement, and everyday usability.
Engine & Performance
Powering the Mercedes-Benz SLK (R171, facelift 2008) SLK 300 V6 is the M 272.942 3.0-liter V6 engine. This naturally aspirated powerplant is known for its smooth operation and linear power delivery. Configured longitudinally at the front of the vehicle, it drives the rear wheels, adhering to a classic sports car layout. The engine features a Double Overhead Camshaft (DOHC) valvetrain with four valves per cylinder, optimizing breathing and performance throughout the rev range. A compression ratio of 11.3:1 contributes to both responsiveness and fuel efficiency.
The V6 generates 231 horsepower at 6000 rpm, resulting in a power-per-liter output of 77.1 Hp/l. Torque peaks at 221.27 lb.-ft. (300 Nm) between 2500 and 5000 rpm, providing a broad and usable powerband. This allows for strong acceleration in various driving scenarios, from highway cruising to spirited driving on winding roads. A 6-speed manual transmission is available, catering to drivers who prefer direct control over gear changes. Acceleration from 0 to 60 mph is achieved in 6.0 seconds (0-100 km/h in 6.3 seconds), with a top speed electronically limited to 155.34 mph (250 km/h). Despite its performance capabilities, the SLK 300 V6 achieves a combined fuel economy of 24.2 – 24.8 US mpg (9.5-9.7 l/100 km) according to the NEDC standard, with CO2 emissions between 220-225 g/km, meeting Euro 5 emission standards.
Design & Features
The Mercedes-Benz SLK (R171, facelift 2008) SLK 300 V6 retains the sleek and athletic proportions characteristic of the R171 generation. As a two-door, two-seat roadster, its design emphasizes a dynamic stance with a long hood, short rear deck, and a cab-rearward profile. The facelift introduced subtle styling updates, including a redesigned front bumper with a more pronounced V-shape, a revised grille, and darker-tinted taillight lenses, giving the car a fresher and more aggressive appearance.
The defining feature of the SLK is its “vario-roof,” a retractable hardtop that provides the benefits of both a coupe and a roadster. This mechanism can stow the roof in the trunk in approximately 22 seconds, transforming the car’s character at the touch of a button. With the roof retracted, the trunk offers 7.35 cu. ft. (208 liters) of storage space. The interior features a driver-focused cockpit, typical of Mercedes-Benz designs. The facelift brought minor refinements, including updated instrument cluster graphics and trim options. Standard features include a premium audio system, automatic climate control, and high-quality materials. Safety features include an Anti-lock Braking System (ABS), multiple airbags, and a robust chassis. The hydraulic rack and pinion steering provides direct feedback, complemented by an independent McPherson front suspension and a multi-link rear suspension with transverse stabilizers, ensuring precise handling and a comfortable ride.
Technical Specifications
| Category | Specification |
| Brand | Mercedes-Benz |
| Model | SLK |
| Generation | SLK (R171, facelift 2008) |
| Type (Engine) | SLK 300 V6 (231 Hp) |
| Start of Production | April, 2009 |
| End of Production | January, 2011 |
| Powertrain Architecture | Internal Combustion Engine |
| Body Type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Performance Specifications | |
| Fuel Consumption (Urban, NEDC) | 13.9-14.1 l/100 km (16.7 – 16.9 US mpg) |
| Fuel Consumption (Extra Urban, NEDC) | 6.8-7.0 l/100 km (33.6 – 34.6 US mpg) |
| Fuel Consumption (Combined, NEDC) | 9.5-9.7 l/100 km (24.2 – 24.8 US mpg) |
| CO2 Emissions (NEDC) | 220-225 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 6.0 sec |
| Maximum Speed | 155.34 mph (250 km/h, Electronically limited) |
| Emission Standard | Euro 5 |
| Weight-to-Power Ratio | 6 kg/Hp (167.4 Hp/tonne) |
| Weight-to-Torque Ratio | 4.6 kg/Nm (217.4 Nm/tonne) |
| Engine Specifications | |
| Power | 231 Hp @ 6000 rpm |
| Power per Liter | 77.1 Hp/l |
| Torque | 221.27 lb.-ft. @ 2500-5000 rpm (300 Nm) |
| Engine Layout | Front, Longitudinal |
| Engine Model/Code | M 272.942 |
| Engine Displacement | 2996 cm3 (182.83 cu. in.) |
| Number of Cylinders | 6 |
| Engine Configuration | V-engine |
| Cylinder Bore | 3.46 in. (88 mm) |
| Piston Stroke | 3.23 in. (82.1 mm) |
| Compression Ratio | 11.3:1 |
| Number of Valves per Cylinder | 4 |
| Fuel Injection System | Multi-port manifold injection |
| Engine Aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
The Mercedes-Benz SLK (R171, facelift 2008) SLK 300 V6 played a significant role in solidifying the SLK’s position as a desirable and attainable luxury roadster. It successfully blended open-air driving enjoyment, Mercedes-Benz refinement, and a relatively accessible price point. The availability of a manual transmission further enhanced its appeal to driving enthusiasts. The SLK 300 V6 remains a celebrated variant for those who appreciate a well-engineered and stylish convertible that delivers a classic Mercedes-Benz driving experience.
