The Mercedes-Benz SL (R230) facelift, produced from 2008 to 2011, represented a significant evolution of the fifth-generation SL roadster. Among the various engine options available, the SL 350 V6 with the 7G-TRONIC automatic transmission occupied a crucial middle ground in the lineup. This variant offered a blend of performance, luxury, and relative affordability compared to the higher-powered SL 550 and SL 63 AMG models. It was positioned as the entry point into the R230 facelift range for buyers prioritizing a comfortable grand touring experience over outright speed.
SL 350 V6 (2008-2011): An Overview
The SL 350 V6, introduced with the 2008 facelift, aimed to broaden the appeal of the R230 SL. The facelift itself brought cosmetic updates including revised headlights, taillights, and front and rear bumpers, along with interior enhancements. The SL 350 specifically targeted buyers who desired the prestige and open-air driving experience of the SL but didn’t necessarily require the substantial power of the larger displacement engines. It provided a more fuel-efficient and accessible option within the SL family.
Powertrain & Engine Architecture
The heart of the SL 350 is the M272.968 3.5-liter naturally aspirated V6 engine. This engine is a 60-degree V-engine, featuring a single overhead camshaft (SOHC) valvetrain with four valves per cylinder. It utilizes direct fuel injection, a technology that improves fuel efficiency and power output by injecting fuel directly into the combustion chamber. The engine produces 316 horsepower at 6500 rpm and 360 Nm (265.52 lb-ft) of torque at 4900 rpm. The bore and stroke are 92.9 mm (3.66 in) and 86 mm (3.39 in) respectively, resulting in a displacement of 3498 cm³ (213.46 cu. in). The compression ratio is 10.5:1.
The engine is longitudinally mounted in the front of the vehicle. Power is transmitted to the rear wheels via the 7G-TRONIC seven-speed automatic transmission. This transmission, a hallmark of Mercedes-Benz technology at the time, offered smooth and responsive shifting, contributing to both performance and fuel economy. The 7G-TRONIC features a torque converter and electronically controlled gear changes, allowing for both automatic and manual shifting via steering wheel-mounted paddles (optional on some models).
Driving Characteristics
The SL 350 V6 delivers a refined and comfortable driving experience. While not as aggressively powerful as the V8 models, the 316 hp engine provides ample power for both highway cruising and spirited driving. Acceleration from 0 to 60 mph is achieved in approximately 5.9 seconds, and 0-100 km/h takes 6.2 seconds. Top speed is electronically limited to 250 km/h (155.34 mph). The 7G-TRONIC transmission plays a key role in optimizing performance, providing quick and seamless gear changes.
Compared to the SL 550 and SL 63 AMG, the SL 350 offers a more relaxed and manageable power delivery. The V8 models provide significantly more torque and acceleration, but at the expense of fuel economy and a more demanding driving experience. The SL 350’s power band is well-suited to everyday driving, offering sufficient torque for effortless overtaking and merging. The gear ratios in the 7G-TRONIC are optimized for both fuel efficiency and performance, providing a balance between responsiveness and comfort.
Equipment & Trim Levels
The SL 350 came standard with a comprehensive list of features, reflecting its positioning as a luxury roadster. Standard equipment typically included leather upholstery, automatic climate control, power-adjustable seats, a premium sound system, and bi-xenon headlights. The interior design featured high-quality materials and a sophisticated layout.
Optional extras were plentiful, allowing buyers to customize their SL 350 to their preferences. Popular options included the COMAND infotainment system with navigation, a panoramic sunroof, active body control suspension (ABC), heated and ventilated seats, and a premium audio upgrade. Interior trim options included various wood veneers and aluminum accents. The SL 350 was often seen with the Sport Package, which added features like sport seats, AMG styling elements, and a sport-tuned suspension.
Chassis & Braking
The R230 SL chassis is a robust and well-engineered platform. The SL 350 utilizes a coil spring, independent multi-link suspension at both the front and rear. This suspension setup provides a comfortable ride while maintaining good handling characteristics. The car’s weight distribution is optimized for balanced handling.
Braking duties are handled by ventilated discs at all four corners, providing ample stopping power. The SL 350 is equipped with ABS (Anti-lock Braking System) as standard, enhancing safety and control during emergency braking situations. The steering system is a hydraulic power steering rack and pinion, offering precise and responsive steering feel. The standard tire size is 255/45 R 17, mounted on 8.5 J x 17 inch wheel rims.
Market Reception & Comparison
The SL 350 V6 was generally well-received by automotive critics. It was praised for its comfortable ride, refined engine, and luxurious interior. Critics noted that while it didn’t offer the same level of performance as the V8 models, it provided a compelling alternative for buyers who prioritized comfort and fuel efficiency. Fuel economy figures are rated at 9.7 l/100 km (24.2 US mpg, 29.1 UK mpg) combined, and CO2 emissions are 226 g/km (Euro 5 standard).
Compared to the SL 550, the SL 350 offered a significant price advantage, making it more accessible to a wider range of buyers. The SL 550, with its larger V8 engine, delivered more power and a more exhilarating driving experience, but at a higher cost and with lower fuel economy. The SL 63 AMG, the performance flagship of the R230 range, was in a different league altogether, offering track-worthy performance and a significantly higher price tag.
Technical Specifications
| Engine Model/Code | M 272.968 |
| Engine Displacement | 3498 cm3 (213.46 cu. in.) |
| Number of Cylinders | 6 |
| Engine Configuration | V-engine |
| Cylinder Bore | 92.9 mm (3.66 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| Compression Ratio | 10.5:1 |
| Number of Valves per Cylinder | 4 |
| Fuel Injection System | Direct Injection |
| Engine Aspiration | Naturally Aspirated |
| Power | 316 Hp @ 6500 rpm |
| Torque | 360 Nm @ 4900 rpm (265.52 lb.-ft. @ 4900 rpm) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0-100 km/h | 6.2 sec |
| Acceleration 0-60 mph | 5.9 sec (Calculated) |
| Maximum Speed | 250 km/h (155.34 mph) – Electronically Limited |
| Kerb Weight | 1750 kg (3858.09 lbs.) |
| Max. Weight | 2120 kg (4673.8 lbs.) |
| Fuel Tank Capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 4562 mm (179.61 in.) |
| Width | 1820 mm (71.65 in.) |
| Height | 1317 mm (51.85 in.) |
| Wheelbase | 2560 mm (100.79 in.) |
| Transmission | 7-speed automatic (7G-TRONIC) |
Legacy
The SL 350 V6 (R230 facelift) has proven to be a relatively reliable and durable vehicle. The M272 engine is known for its longevity, provided it receives regular maintenance. Common issues include oil leaks and occasional problems with the electronic systems. The 7G-TRONIC transmission is generally reliable, but may require servicing at higher mileages.
On the used car market today, the SL 350 represents a good value proposition for buyers seeking a luxurious and stylish roadster. Prices are generally lower than those of the V8 models, making it an attractive option for those on a budget. The SL 350’s blend of performance, comfort, and reliability has ensured its continued popularity among enthusiasts and collectors alike.
