The Mercedes-Benz CLK 350, produced from 2005 to 2009 as part of the C209 facelift generation, represented a compelling blend of luxury, performance, and technology within the Mercedes-Benz lineup. Positioned as a mid-range offering within the CLK series, it slotted between the entry-level CLK 280 and the higher-performance CLK 55 AMG. This variant was primarily aimed at buyers seeking a sophisticated grand tourer with ample power and a comfortable driving experience. The C209 CLK, in general, was a significant model for Mercedes-Benz, offering an alternative coupe and convertible body style to the more traditional E-Class sedans and coupes.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLK |
| Generation | CLK (C209, facelift 2005) |
| Type | CLK 350 (272 Hp) 7G-TRONIC |
| Start of production | 2005 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 14.3-14.4 l/100 km (16.4 – 16.3 US mpg, 19.8 – 19.6 UK mpg, 7 – 6.9 km/l) |
| Fuel consumption (extra urban) | 7.3-7.4 l/100 km (32.2 – 31.8 US mpg, 38.7 – 38.2 UK mpg, 13.7 – 13.5 km/l) |
| Fuel consumption (combined) | 9.9-10 l/100 km (23.8 – 23.5 US mpg, 28.5 – 28.2 UK mpg, 10.1 – 10 km/l) |
| CO2 emissions | 237-241 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.4 sec |
| Acceleration 0 – 62 mph | 6.4 sec |
| Acceleration 0 – 60 mph | 6.1 sec |
| Maximum speed | 250 km/h (155.34 mph) – Electronically limited |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 5.7 kg/Hp, 176.6 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 227.3 Nm/tonne |
| Power | 272 Hp @ 6000 rpm |
| Torque | 350 Nm @ 2400-5000 rpm (258.15 lb.-ft. @ 2400-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 272.960 |
| 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 | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant capacity | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1540 kg (3395.12 lbs.) |
| Max. weight | 2050 kg (4519.48 lbs.) |
| Max load | 510 kg (1124.36 lbs.) |
| Trunk (boot) space (minimum) | 435 l (15.36 cu. ft.) |
| Fuel tank capacity | 62 l (16.38 US gal | 13.64 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load (with brakes) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load (without brakes) | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4652 mm (183.15 in.) |
| Width | 1740 mm (68.5 in.) |
| Width including mirrors | 1991 mm (78.39 in.) |
| Height | 1415 mm (55.71 in.) |
| Wheelbase | 2715 mm (106.89 in.) |
| Front track | 1497 mm (58.94 in.) |
| Rear track | 1478 mm (58.19 in.) |
| Front overhang | 854 mm (33.62 in.) |
| Rear overhang | 1083 mm (42.64 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle | 10.76 m (35.3 ft.) |
| Drivetrain | Rear wheel drive |
| Gearbox | 7 gears, automatic transmission 7G-TRONIC |
| Front suspension | Independent type McPherson, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size (Front) | 225/45 R 17 |
| Tires size (Rear) | 245/40 R 17 |
| Wheel rims size (Front) | 7.5 J x 17 |
| Wheel rims size (Rear) | 8.5 J x 17 |
Powertrain & Engine Architecture
The CLK 350 was powered by the M272.960 3.5-liter naturally aspirated V6 engine. This engine was a cornerstone of Mercedes-Benz’s mid-range offerings during the mid-2000s. It featured a 60-degree V-angle, aluminum alloy block and cylinder heads, and dual overhead camshafts (DOHC) per cylinder bank. The engine utilized a multi-port fuel injection system, delivering fuel directly into the intake ports. The M272 engine was known for its smooth operation and relatively high power output for its displacement. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission. This transmission was a significant advancement over previous Mercedes-Benz automatics, offering smoother shifts, improved fuel efficiency, and a wider range of gear ratios. The 7G-TRONIC featured a torque converter lock-up clutch that engaged in most gears, reducing slippage and improving efficiency.
Driving Characteristics
The CLK 350 with the 7G-TRONIC transmission provided a refined and comfortable driving experience. While not as overtly sporty as the CLK 55 AMG, the 272 horsepower and 258 lb-ft of torque were sufficient for brisk acceleration. The 0-60 mph sprint was typically achieved in around 6.1 seconds. The 7G-TRONIC transmission contributed to smooth and almost imperceptible gear changes, enhancing the overall driving experience. Compared to the manual transmission options available on other CLK models, the automatic prioritized comfort and ease of use over outright performance. The gear ratios were tuned for relaxed cruising and responsive acceleration in everyday driving situations.
Equipment & Trim Levels
The CLK 350 typically came standard with a generous array of features, including leather upholstery, automatic climate control, power-adjustable front seats, a premium sound system, and a sunroof. Optional extras included navigation system, upgraded leather packages, sport packages (which often included stiffer suspension and sport seats), and various cosmetic enhancements. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences. The standard dashboard configuration featured analog gauges with a central multi-function display.
Chassis & Braking
The CLK 350 utilized an independent suspension system at all four wheels. The front suspension employed a McPherson strut design, while the rear featured a multi-link setup. Both ends of the suspension were equipped with stabilizer bars to reduce body roll during cornering. The braking system consisted of ventilated discs at the front and solid discs at the rear. Anti-lock braking system (ABS) was standard. The suspension tuning was geared towards providing a comfortable ride, prioritizing smoothness over aggressive handling.
Market Reception & Comparison
The CLK 350 was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and luxurious interior. However, some reviewers noted that it lacked the outright sporting character of its competitors, such as the BMW 3 Series Coupe. Fuel economy was considered average for its class, with combined figures around 23.8-23.5 mpg. Compared to the CLK 280, the 350 offered a significant performance upgrade, while the CLK 55 AMG provided even more power but at a higher price point and with a firmer ride.
Legacy
The M272 engine, found in the CLK 350, has proven to be a relatively reliable powertrain when properly maintained. Common issues include oil leaks from the valve cover gaskets and potential problems with the balance shaft. The 7G-TRONIC transmission is also generally reliable, but requires regular fluid changes to prevent issues. Today, the CLK 350 represents an affordable entry point into the Mercedes-Benz grand touring experience. Well-maintained examples are sought after by enthusiasts who appreciate their blend of luxury, performance, and classic Mercedes-Benz styling. The car’s relative reliability and availability of parts contribute to its continued appeal in the used car market.
