Mercedes S320 CDI: Expert Review And Ownership Guide

The Mercedes S320 CDI stands as a benchmark in the luxury sedan segment, combining a refined diesel powertrain with the hallmark comfort and sophistication of the S-Class lineup. This model delivers effortless cruising, impressive fuel economy for its size, and an interior that redefines executive travel, making it a compelling choice for those seeking prestige without compromise.

Engine Power and Performance Excellence

At the heart of the S320 CDI lies a 3.2-liter V6 turbodiesel engine producing around 200 horsepower, paired with robust torque for smooth acceleration. Despite its substantial weight nearing two tons, the car accelerates from 0-60mph in approximately eight seconds, showcasing respectable pace for a vehicle designed primarily for grand touring rather than track assaults.

On motorways, the engine hums at just 1,600rpm at 70mph, ensuring serene highway journeys with minimal noise intrusion. Real-world tests reveal fuel consumption as low as 10-12L/100km in mixed urban conditions, while long-distance runs can achieve over 40mpg, proving its efficiency edge over petrol counterparts.

• Key Performance Stats: 0-60mph in 8 seconds; top speed electronically limited; torque delivery ideal for overtaking.
• Remapping options boost output significantly, enhancing responsiveness without sacrificing reliability in many cases.
• Cruising refinement masks its diesel nature, with effortless power build-up from low revs.

Superior Ride Comfort and Handling Dynamics

Mercedes’ advanced suspension system excels at ironing out road imperfections, transforming pothole-riddled surfaces into seamless paths. The S320 CDI glides over bumps that unsettle lesser saloons, providing a cosseting experience akin to a private jet.

Handling belies its 5.2-meter length; the steering is light and precise for parking maneuvers, though it offers limited feedback at higher speeds. On twisty roads, it remains composed, with minimal body roll and agile turn-in for such a behemoth.

Interior Opulence and Practical Space

Step inside, and the cabin envelops occupants in premium materials, with superlative build quality and ergonomic design. Rear passengers enjoy limousine-like legroom, especially in long-wheelbase variants, surpassing even some ultra-luxury rivals.

Simple, intuitive controls and ample storage keep family trips stress-free, including individual 12V outlets for rear seats. The dashboard’s array of buttons entertains younger occupants during long hauls.

• Seating: Multi-adjustable, jet-like comfort with heating options.
• Space: Vast rear legroom; boot capacity suits executive needs.
• Tech: Clear displays, though complex electronics demand familiarity.

Fuel Efficiency and Running Costs

The diesel engine shines in economy, posting 42.5mpg on 375-mile road trips with mixed loads, far better than thirstier V8 models. Urban figures hover around 10-12L/100km, competitive for a prestige saloon.

However, high initial pricing—around £60,000 for long-wheelbase—positions it above rivals like BMW’s 730d. Standard versions save £4,000 without sacrificing much.

Reliability Concerns for Used Buyers

While the powertrain proves durable, the S-Class’s complexity introduces risks: air suspension failures, electronic gremlins, and costly repairs plague older examples. Maintenance demands premium parts and specialist knowledge, inflating ownership costs.

Owners report strong engine longevity post-remap, but chassis electronics and suspension require vigilant upkeep. At bargain prices, it’s a luxury gamble—rewards come with potential pitfalls.

Comparing the S320 CDI to Rivals

Against the BMW 7 Series, the Mercedes offers superior ride comfort but trails in sporty handling. Petrol S-Class variants like the S430 outpace it off the line but guzzle more fuel.

Ownership Verdict: Worth the Investment?

For motorway miles and family duties, the S320 CDI excels with space, comfort, and efficiency. It’s the ultimate relaxer, though used buyers must budget for repairs. Ideal for those prioritizing refinement over raw speed.

Frequently Asked Questions (FAQs)