Mercedes CLS 350 CDI In-Depth Review: Power And Economy

The Mercedes CLS 350 CDI represents a pinnacle of engineering where diesel efficiency meets high-end luxury in a distinctive four-door coupe body. This model, powered by a 3.0-liter V6 diesel engine producing 265 horsepower and a massive 620 Nm of torque, offers drivers an exceptional balance of spirited performance and economical operation. From its smooth acceleration to its serene cabin, the CLS 350 CDI excels in delivering effortless overtaking power and impressive fuel economy figures, making it a compelling choice for those seeking grand touring capability without compromise.

Engine Performance: A Diesel Force to Reckon With

At the heart of the Mercedes CLS 350 CDI lies a sophisticated 2,987 cc V6 diesel engine, refined under Mercedes’ BlueEFFICIENCY program to enhance power delivery while curbing consumption. This powerplant churns out 265 hp and peaks at 620 Nm of torque available from as low as 1,600 rpm, providing immediate throttle response across a broad rev range. The engine’s character shines brightest between 2,500 and 3,500 rpm, where it delivers a strong surge that propels the nearly five-meter-long vehicle with authority.

Paired with a 7G-Tronic seven-speed automatic transmission, gear shifts are smooth and well-timed, though not as instantaneous as a dual-clutch setup. In Sport mode, the gearbox holds gears longer for more aggressive acceleration. Opting for the 4Matic all-wheel-drive variant further sharpens responsiveness, distributing power effectively for superior traction. Acceleration from 0-100 km/h clocks in at 6.2 seconds, with a governed top speed of 250 km/h, impressive for a car weighing around 1,800 kg.

Real-world testing confirms the CLS 350 CDI’s prowess on highways, where overtaking maneuvers require only a light tap on the accelerator, thanks to the abundant low-end torque. The engine’s refined nature means minimal turbo lag, with a quiet idle that transitions to a pleasing growl under hard acceleration, reminiscent of a V8 petrol unit.

Fuel Efficiency: Economy Without Sacrifice

Mercedes engineered the CLS 350 CDI for frugality, achieving up to 47 mpg (approximately 6.0 L/100 km combined) in official figures, a 21% improvement over its predecessor. Independent tests validate these claims: on dual carriageways over 1,200 km, consumption averaged 5.8 L/100 km; rural roads saw 6.2 L/100 km; urban driving peaked at 9.5 L/100 km due to the car’s size. Highway cruising at 1,700 rpm contributes to these low figures, ideal for long-distance travel.

• Highway: 5.8 L/100 km – Excellent for sustained high-speed runs.
• Roads: 6.2 L/100 km – Balanced for mixed conditions.
• City: 9.5 L/100 km – Acceptable given dimensions and power.

These efficiencies stem from BlueEFFICIENCY enhancements like optimized aerodynamics and engine tuning, ensuring the CLS remains cost-effective to run despite its premium positioning.

Driving Dynamics: Comfort Meets Agility

The CLS 350 CDI prioritizes grand touring comfort with a soft suspension setup that absorbs imperfections smoothly, though it can feel floaty over undulating surfaces at highway speeds. The electromechanical steering is a highlight, offering precise weighting for parking and city maneuvers while providing adequate feedback at speed without fatigue on extended drives.

With optional Sports suspension, handling sharpens considerably, reducing body roll in corners and enhancing responsiveness on twisty roads. The standard seven-speed auto includes paddle shifters for manual control, adding engagement during spirited driving. Despite its length and weight, the car feels agile, making it more capable than expected in dynamic scenarios.

Design and Exterior: Iconic Four-Door Coupe Styling

The CLS 350 CDI’s sleeker profile and updated front fascia distinguish it from traditional sedans, embodying Mercedes’ ‘four-door coupe’ philosophy. Measuring 4.94 meters, its elegant lines turn heads while maintaining practicality. Aerodynamic tweaks under BlueEFFICIENCY contribute to efficiency without detracting from its imposing presence.

Interior Luxury: Spacious and Sophisticated

Inside, the cabin exudes premium quality with high-grade materials and an elegant layout. Despite the coupe-like roofline, rear seating proves surprisingly accommodating for adults, with good legroom and comfort. The front offers supportive seats, ample space, and a hushed ambiance perfect for serene travel. Visibility aids like optional quick-fold rear seats enhance versatility.

Build quality is impeccable, creating a relaxed environment where road noise is minimal, and only subtle diesel tones intrude during enthusiastic driving.

Safety and Practicality Features

Earning a five-star ANCAP rating, the CLS 350 CDI includes standard safety tech like multiple airbags and stability control. Practical touches include a generous boot and four-seat configuration suited for families or executives. The diesel’s torque-laden nature suits towing or heavy loads effortlessly.

Comparison with Rivals

The CLS edges out competitors in torque and style, though rivals may offer similar dynamics.

Ownership Considerations

Priced around $159,200 (2011 guide), the CLS 350 CDI justifies its cost with low running expenses and reliability. Maintenance follows Mercedes’ premium schedule, but diesel longevity is a plus.

Frequently Asked Questions (FAQs)

Is the CLS 350 CDI suitable for daily driving?

Yes, its comfort, efficiency, and ease of use make it excellent for commutes and long trips.

How does the diesel engine sound?

Refined and quiet at idle, with a sporty growl when pushed, akin to a petrol V8.

What’s the real-world fuel economy?

Averages 5.8-6.2 L/100 km on highways and roads, up to 9.5 in cities.

Does it have all-wheel drive?

Available as 4Matic for better traction and performance.

Is the rear space practical?

Surprisingly good for a coupe, comfortable for adults on shorter journeys.