Mercedes CLS 350 CDI: 265 Hp, 620 Nm Performance Review

The Mercedes CLS 350 CDI stands as a benchmark in the luxury coupe-sedan segment, combining elegant styling with a robust diesel powertrain. This model, powered by a 3.0-liter V6 diesel engine producing 265 horsepower and up to 620 Nm of torque, offers a compelling mix of performance, efficiency, and comfort. Launched as part of the refreshed CLS lineup, it appeals to drivers who demand sophistication without sacrificing dynamic capabilities.

Striking Exterior Design

The CLS 350 CDI captures attention with its sleek, aerodynamic profile. Measuring nearly 5 meters in length, the car’s flowing lines and low stance give it a coupé-like allure despite four doors. Engineers optimized aerodynamics, achieving a drag coefficient as low as 0.26 Cd, which contributes to both visual appeal and real-world efficiency gains of up to 13 percent over predecessors.

Key exterior highlights include:

• Sharp LED headlights with distinctive daytime running lights for enhanced visibility and style.
• Smooth, sculpted flanks that emphasize the car’s muscular presence.
• 18-inch alloy wheels (standard on most trims) that fill the arches perfectly, with options for larger 19-inch rims.
• A subtle rear diffuser and twin exhaust tips, hinting at the diesel engine’s power.

This design not only turns heads but also supports the vehicle’s impressive highway stability, making long journeys effortless.

Powerful Yet Efficient Engine

At the heart of the CLS 350 CDI is a 2,987 cc V6 diesel engine, badged as the 350 CDI with BlueEFFICIENCY technology. It delivers 265 hp and a massive 620 Nm of torque from just 1,600 rpm, enabling a 0-100 km/h sprint in 6.2 seconds and a top speed electronically limited to 250 km/h.

The seven-speed 7G-Tronic automatic transmission shifts smoothly, with paddle shifters on the steering wheel for manual control. In sport mode, it holds gears longer, maximizing the engine’s strong mid-range pull between 2,500-3,500 rpm. Real-world testing confirms overtaking is effortless, even at highway speeds, thanks to the instant torque response.

For optimal traction, pairing with 4MATIC all-wheel drive is recommended, enhancing acceleration and handling in varied conditions.

Impressive Fuel Economy

Despite its performance credentials, the CLS 350 CDI excels in efficiency. Official combined figures hover around 6.0-6.1 L/100 km, with CO2 emissions at 159-160 g/km. Real-world tests validate this: 5.8 L/100 km on dual carriageways over 1,200 km, 6.2 L/100 km on roads, and 9.5 L/100 km in urban driving.

BlueEFFICIENCY features like low-rolling-resistance tires, optimized aerodynamics, and an electromechanical Direct Steer system contribute to these numbers. The system reduces fuel use by 0.3 L/100 km without compromising steering feel. While stop-start (ECO Start) is available on some variants, it’s not standard on the 350 CDI but planned for later models.

• Highway: Exceptionally frugal at under 6 L/100 km.
• Mixed driving: Balances power with economy effectively.
• City: Higher consumption due to size, but still respectable for the class.

Refined Interior and Comfort

Step inside, and the CLS 350 CDI envelops occupants in premium materials. The cabin boasts high-quality leather, wood or aluminum trims, and a hushed ambiance ideal for grand touring. Front seats are supportive with multi-way adjustments, heating, and ventilation options. Rear space accommodates two adults comfortably, with good legroom and headroom despite the sloping roofline—surprisingly practical for a four-seater.

Technology shines with the COMAND infotainment system, featuring a large central screen, navigation, Bluetooth, and premium audio. Ambient lighting in multiple colors enhances the mood, while the instrument cluster provides clear, customizable displays.

Comfort features include:

• Adaptive air suspension (optional) for supreme ride quality.
• Active noise cancellation for a library-quiet interior.
• Climate control with individual rear vents.

Boot space measures 520 liters, expandable by folding the rear seats, making it versatile for weekend getaways.

Dynamic Handling and Ride

Handling belies the car’s 1,800 kg weight. The chassis delivers a composed ride, absorbing bumps while maintaining body control in corners. Direct Steer provides precise feedback, variable ratio aiding maneuverability despite the 2.87-meter wheelbase.

On twisty roads, the CLS feels agile, with minimal body roll and strong grip from wide tires. The diesel’s low-end torque makes it forgiving, while the auto box’s quick shifts add engagement. Highway cruising is its forte—stable, quiet, and effortless for overtakes.

Safety is comprehensive: multiple airbags, stability control, attention assist, and optional blind-spot monitoring. Euro NCAP ratings (from era equivalents) highlight strong crash protection.

Ownership Considerations

Pricing positioned the CLS 350 CDI as a premium choice, competing with BMW 6 Series Gran Coupe and Audi A7. Running costs benefit from diesel economy and long service intervals. Reliability is solid, though maintenance requires Mercedes specialists.

Pros:

• Stunning looks and presence.
• Potent, torquey engine.
• Excellent fuel efficiency.
• Luxurious, comfortable interior.

Cons:

• Limited rear headroom for tall passengers.
• Higher urban fuel use.
• Premium pricing.

FAQ

What is the fuel consumption of the Mercedes CLS 350 CDI?

Combined figures are around 6.0 L/100 km, with real-world highway use at 5.8 L/100 km and city at 9.5 L/100 km.

How fast is the 0-100 km/h acceleration?

It achieves 0-100 km/h in 6.2 seconds, powered by 265 hp and 620 Nm torque.

Is the CLS 350 CDI available with all-wheel drive?

Yes, the 4MATIC version is recommended for better traction and response.

How practical is the interior for four passengers?

Front seats are spacious; rear offers good legroom for adults, though headroom is tighter due to the roofline.

What transmission does it use?

A seven-speed 7G-Tronic automatic with paddle shifters for manual control.