Mercedes CLS Prototype Ride Review: Inline-Six Power

The Mercedes CLS prototype represents a bold evolution in the luxury four-door coupe segment, blending striking aesthetics with cutting-edge engineering. This pre-production model promises to deliver a harmonious mix of sporty performance and grand touring comfort, drawing from shared platforms with the E-Class while introducing unique styling cues and powertrains.

Design and Aerodynamics: Form Meets Function

The CLS prototype captivates with its sweeping lines and coupe-like silhouette, distinguishing it from more conventional sedans. Despite its elegant, flowing profile, engineers have optimized aerodynamics to achieve a drag coefficient of 0.26, slightly higher than the E-Class’s 0.23 due to efforts to maintain a spoiler-free rear for visual purity. This design choice ensures the rear axle stays planted at high speeds, enhancing stability without compromising the car’s signature sleekness.

Wheelbase and axle components are borrowed from the E-Class MRA platform, but adjusted tracks and lengths give the CLS a more aggressive stance, with 19-inch wheels appearing stretched to the corners. LED headlamps project light up to half a mile ahead, while two-pane acoustic glass creates a vault-like cabin silence, allowing just enough engine note to filter through for an engaging drive.

Powertrain Innovations: The Rise of the Inline-Six

At the heart of the CLS prototype lies the M256 3.0-liter inline-six engine, turbocharged, supercharged, and mild-hybridized for 367 horsepower and 369 lb-ft of torque in the CLS450 variant. It propels the car to 62 mph in 5.0 seconds with a throaty snarl that elevates the driving experience. A detuned version compared to S-Class applications, it still offers seamless power delivery, aided by EQ Boost’s 48-volt system for instant torque fills.

The forthcoming AMG CLS53 ups the ante with 429-430 hp and 384 lb-ft, achieving 0-62 mph in 4.5 seconds. Reviewers note its smooth yet potent surge, though some critique the delivery as refined rather than raw, lacking the visceral thrill of pure AMG models. All-wheel drive dynamically shifts between rear and full torque distribution, promoting neutral handling.

This table highlights the performance hierarchy, positioning the CLS as a versatile performer across trims.

Chassis and Handling: Precision Engineering in Action

The prototype’s suspension shines with exquisite rebound damping on standard steel springs, delivering flat cornering even in Comfort mode. During dynamic tests on coastal roads and chicanes, it squats solidly under load, maintaining composure. Air suspension variants further refine the ride, offering plush comfort for daily use while firming up for spirited drives.

Body control impresses at speed, with a low center of gravity fostering confidence on highways and twisty byways. Steering provides weight and directness, though standard models feel somewhat numb compared to AMG’s more communicative setup. Drive modes—Eco, Comfort, Sport—default to Comfort, with Intelligent Eco optimizing fuel via navigation and radar for ‘sailing’ coasting. High-speed stability and predictable braking underscore its grand tourer credentials.

• Comfort Mode: Ideal for long hauls, balancing efficiency and ride quality.
• Sport Mode: Sharpens throttle response and suspension for engaging dynamics.
• Eco/Sailing: Engine cuts out during coasting, restarting seamlessly for peak efficiency.

Interior Refinement: Luxury Redefined

Inside, the CLS prototype envelops occupants in premium leather seats that secure without fatigue on extended trips. Unique to the model, the cabin borrows S-Class electronics but adds bespoke touches, creating a cocoon of quietude via laminated glass and insulation. Five passengers fit comfortably, an upgrade from prior four-seat layouts, though rear space demands some compromise—tight headroom and knee splay due to the coupe roofline.

Ergonomics prioritize driver focus, with intuitive controls and a supportive steering wheel. Advanced driver aids operate unobtrusively, enhancing safety on long journeys. The ambiance suits boulevard cruising or highway dominance equally.

Practicality and Rear Passenger Experience

While the design favors front-seat drama, rear accommodations prove surprisingly viable. Supportive seats handle hours comfortably, suitable for winery runs or family outings. Ingress requires care to avoid headliner scrapes, and headrests prioritize safety over plushness to preserve rear visibility. Overall, it’s more practical than pure coupes, competing with Audi A7 and BMW 6 Series Gran Coupe.

Competitive Landscape: How CLS Stands Out

The CLS slots between sporty sedans like Porsche Panamera and refined rivals such as Audi S7. Stiffer than E-Class yet softer than AMG GT 4-Door, it excels in ride comfort and tech. The AMG variant injects sportiness without sacrificing luxury, though purists may eye the GT line for sharper thrills. Its ‘cultured sporty’ ethos revives the four-door coupe niche with modern powertrains.

Technology and Safety Features

Mercedes integrates S-Class-level electronics, including adaptive cruise, lane-keeping, and predictive efficiency tools. LED lighting and acoustic engineering elevate everyday usability, while mild-hybrid tech boosts refinement. Braking remains strong and progressive, with stability systems intervening subtly.

Frequently Asked Questions (FAQs)

What platform does the Mercedes CLS prototype use?

It shares the MRA platform with the E-Class, with tailored dimensions for its coupe styling.

How does the CLS450 engine perform?

Delivering 367 hp, it hits 62 mph in 5.0 seconds with smooth, hybridized power.

Is the rear seat practical in the CLS?

Yes for shorter trips; it’s supportive but space-constrained by the roofline.

What’s the ride like compared to rivals?

Smoother than AMG GT, sportier than E-Class, with excellent body control.

When will the production CLS launch?

Prototypes spotted in 2018 suggest a 2019 debut, evolving into 2022 updates.

Driving Impressions: A Prototype’s Promise

Riding the CLS prototype reveals a car that nails the luxury-performance balance. From San Francisco coasts to Barcelona byways, it exudes poise—quiet yet alive, comfortable yet capable. The inline-six’s growl adds character, while suspension tuning absorbs imperfections without wallowing. Minor quibbles like rear access pale against its holistic appeal.

For enthusiasts, the AMG53’s neutrality and power tempt, though it prioritizes polish over outright excitement. Daily drivers appreciate the efficiency modes and vault-like cabin. As prototypes hint, the production CLS will redefine executive coupes.