Mercedes CLS 350 CGI Review: Engine, Comfort, Value

The Mercedes CLS 350 CGI stands out as a four-door coupe that masterfully combines striking aesthetics with sophisticated engineering. Powered by a cutting-edge 3.5-liter V6 engine featuring Charge-stratified Gasoline Injection (CGI) technology, this model delivers 288 horsepower and 365 Nm of torque, paired seamlessly with a seven-speed automatic transmission. Its design philosophy emphasizes elegance and performance, making it an ideal choice for those who demand both visual appeal and dynamic capability on the road.

Engine Performance and Efficiency

At the heart of the CLS 350 CGI is its innovative V6 petrol engine, which employs direct injection with spray-guided combustion. This advanced system allows for a lean-burn regime that extends to higher RPMs and loads, thanks to piezoelectric injectors that provide precise fuel delivery. The result is diesel-like torque delivery paired with the refinement expected from premium petrol powerplants. On test drives, the engine proves whisper-quiet during cruising, yet responds alertly under acceleration, emitting a pleasing baritone note when pushed.

Performance figures include a 0-60 mph time of approximately 6.7 seconds, which, while not the quickest in its class against diesel rivals, feels composed and effortless in real-world scenarios. The seven-speed 7G-Tronic automatic transmission excels at higher speeds, optimizing torque for smooth overtaking and highway merges, though it can exhibit slight hesitation off the line. Fuel economy reaches up to 30.1 mpg on the combined cycle with sulfur-free fuel, with real-world testing yielding 24.5 mpg over extended journeys—respectable for a luxury grand tourer.

Design and Aerodynamics

The CLS 350 CGI’s silhouette defines the ‘four-door coupe’ segment, with a sleek roofline that enhances its aerodynamic profile. This design not only turns heads but also contributes to efficiency and stability at speed. Frontal styling features the signature Mercedes grille, flanked by sharp LED headlights, while the shark-nosed profile flows into muscular haunches and subtle rear diffuser elements. Available in various colors, it exudes sophistication suitable for urban or long-distance travel.

• Sleek roofline: Improves aerodynamics but slightly compromises rear headroom.
• Premium materials: High-quality paint and chrome accents elevate its presence.
• Wheel options: Up to 19-inch alloys for enhanced stance and grip.

Interior Comfort and Technology

Step inside, and the cabin welcomes with sumptuous leather upholstery, supportive seats, and an intuitive layout borrowed from Mercedes’ executive lineup. The front offers ample space with multi-contour adjustments, while rear seating accommodates four adults reasonably well, though taller passengers over 6 feet may find headroom limited due to the coupe styling. Materials feel plush, with soft-touch surfaces and ambient lighting creating a serene environment.

Technology shines through the COMAND infotainment system, featuring a high-resolution central screen for navigation, audio, and vehicle settings. A 13-speaker premium sound system delivers immersive audio, complementing the refined cabin insulation that minimizes wind and road noise. Safety features include multiple airbags, stability control, and optional adaptive cruise, making it a secure choice for families or executives.

Driving Dynamics and Handling

Mercedes engineers tuned the CLS 350 CGI’s chassis with multi-link suspension front and rear, delivering a ride that balances comfort and composure. The electric power steering provides on-demand assistance, aiding efficiency while offering decent feedback—far superior to many electric systems. On winding roads, the car remains planted, with minimal body roll and precise turn-in, belying its size. Optional air suspension further refines the experience, ironing out imperfections for cruiser-like poise.

Braking is progressive, though the pedal feel is soft, prioritizing comfort over track-day aggression. The rear-wheel-drive layout encourages playful dynamics when provoked, yet everyday usability remains its forte. Wet or uneven surfaces pose no issue, thanks to advanced traction systems.

Practicality and Ownership Costs

Boot space measures adequately for weekend luggage, with a practical hatchback-style liftgate easing loading. Running costs are competitive: at £46,995 base price, it undercuts some V8 rivals while offering strong residuals at 56%. Servicing over three years totals £877, though dealer satisfaction varies. Road tax stands at £390 annually, with average MPG around 21.7-24.5 depending on conditions.

• Fuel Economy: 24.5 mpg tested; up to 30.1 combined.
• Residual Value: 56% after three years.
• Price: £46,995; optional air suspension £1,295.

Competitive Landscape

In a segment with rivals like the BMW 6-Series Gran Coupe, Audi A7, and Porsche Panamera, the CLS 350 CGI excels in refinement and value. It outpaces the BMW in residuals and matches the Audi in rear access, though diesels from competitors edge it in outright economy. Against the BMW X6, it offers superior seating usability.

Pros and Cons

• Pros: Smooth V6 power, luxurious interior, balanced ride, strong residuals.
• Cons: Rear headroom limitations, soft brakes, optional suspension needed for best dynamics.

FAQs

What is the power output of the CLS 350 CGI engine?

It produces 288 bhp and 365 Nm of torque from its 3.5-liter V6 with CGI technology.

How fuel-efficient is the Mercedes CLS 350 CGI?

Expect 24.5 mpg in mixed testing, with official combined figures up to 30.1 mpg on optimal fuel.

Is the CLS 350 CGI suitable for rear passengers?

Yes for four adults, but those over 6ft may find headroom tight due to the coupe roofline.

What transmission does it use?

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

How does it compare in price to rivals?

At £46,995, it’s competitively priced, though options like air suspension add cost.