Infiniti M30d S: Luxury Diesel Sedan Reviewed

The Infiniti M30d S stands out in the executive sedan segment with its blend of diesel efficiency, robust performance, and high-end features. This rear-wheel-drive model targets drivers who prioritize refinement, technology, and value against established European rivals.

Powerful Diesel Heart Under the Hood

At the core of the Infiniti M30d S is a 3.0-liter turbocharged V6 diesel engine delivering 175 kW of power at 3,750 rpm and a substantial 550 Nm of torque from 1,750 rpm. This setup propels the 1,845 kg sedan from 0-100 km/h in 6.9 seconds, with a top speed of 250 km/h, offering brisk acceleration suitable for highway overtaking and spirited drives.

Paired with a seven-speed automatic transmission, the powertrain adapts to driving styles through a driver-adaptive learning algorithm, ensuring smooth shifts and responsive performance. The diesel unit provides velvety low-end torque, making it punchy from standstill, though it grows gruff at higher revs. Four drive modes—standard, sport, snow, and eco—alter throttle response, suspension firmness, and gearbox behavior, with the default setting emphasizing comfort.

Real-world fuel consumption varies; urban driving and aggressive throttle inputs can push it to 11 L/100km, but highway efficiency shines closer to claims.

Striking Design and Aerodynamic Efficiency

Infiniti’s design language gives the M30d S a low-slung, athletic profile with high wheel arches, a prominent grille, and fluid lines that enhance aerodynamics. Standard 18-inch alloys (upgradable to 20-inch on premium trims) are shod in performance tires like Bridgestone Potenzas, contributing to stable high-speed cruising.

Exterior highlights include Bi-Xenon headlights with auto-leveling, dusk sensors, chrome accents, dual exhausts, and follow-me-home lights. Double-glazed windows and tilting mirrors aid practicality, while the curvaceous shape ensures it turns heads without being overly flashy. The sedan’s stance leans toward sports luxury, setting it apart from more conservative competitors.

Opulent Interior Packed with Technology

Inside, the cabin impresses with a wood-trimmed dashboard, leather upholstery, and a 13-speaker Bose audio system delivering crystal-clear sound with deep bass. However, the interface features around 70 buttons and six knobs, which can overwhelm at first, though steering wheel controls and a touch-sensitive screen mitigate this.

Unique touches like the Forest Air climate system purify air by neutralizing odors and allergens, while Active Noise Control uses speakers to emit counter-waves, reducing road and engine drone for a serene environment. Rear passengers enjoy ample legroom and headroom, though the boot is modestly sized compared to rivals like the BMW 5 Series.

• Spacious front seats with heating and ventilation
• Generous rear legroom for adults
• High-quality materials throughout
• Intuitive dual-zone climate control

Advanced Safety and Driver Assistance Suite

Safety is comprehensive, with Intelligent Brake Assist, Forward Collision Warning, Pre-Crash Safety Belts, and a full airbag array including dual-stage front, side, and curtain bags. Blind-spot monitoring, Lane Departure Prevention, and Distance Control Assist form a ‘bubble of protection,’ enhancing confidence on motorways.

These systems, while marketing-friendly, prove effective in real scenarios, though some intervene abruptly at higher speeds. The rear-wheel-drive layout, aided by optional four-wheel steering on S-Premium models, boosts maneuverability.

Engaging Drive Dynamics and Ride Quality

The M30d S balances comfort and sportiness effectively. Its suspension delivers a plush ride in standard mode, absorbing bumps well, though 20-inch wheels introduce some thumpiness. Sport mode sharpens responses, revealing lively handling thanks to rear-steer tech that nimble turns feel more agile.

Grip levels are high, with electronic aids allowing enthusiastic driving without harshness. It’s closer to European executive saloons than typical Japanese fare, though gearbox refinement trails the class best. Braking is strong, and the diesel’s torque distribution aids hill climbs and overtakes.

Standard Features and Premium Options

Even base models are generously equipped: navigation, reverse camera, keyless entry, adaptive cruise, and parking sensors come standard. S-Premium adds four-wheel steering, larger wheels, and enhanced audio. Against competitors, it undercuts some while matching spec levels.

Rivals Comparison: Value in the Luxury Segment

Priced around £45,000 for top specs, the M30d S competes with BMW 530d and Mercedes E350d. It offers superior standard kit but lags in brand prestige and boot space. Diesel efficiency and torque give it an edge over petrol rivals like the M37 (235 kW, 10.2 L/100km).

• Vs. BMW 5 Series: Similar power, but Infiniti cheaper; smaller boot
• Vs. Audi A6: More torque, unique air purification
• Vs. Lexus GS: Punchier diesel, better handling

Pros and Cons at a Glance

• Pros: Strong diesel torque, loaded features, comfortable ride, advanced safety
• Cons: Busy dashboard, modest boot, gruff engine note, niche brand appeal

Frequently Asked Questions (FAQs)

Is the Infiniti M30d S fuel-efficient?

Claimed at 7.5 L/100km combined, real-world figures range 8-11 L/100km depending on conditions.

How does it handle compared to German rivals?

Engaging with rear-steer option, but electronics limit extremes; ride is compliant.

What safety features does it have?

Comprehensive suite including collision warning, blind-spot intervention, and multiple airbags.

Is the interior spacious?

Front and rear seating is generous, but boot trails segment leaders.

What’s the warranty like?

Infiniti offers a strong package, typically 4 years/unlimited km; check local dealers.

Final Verdict on the Infiniti M30d S

The Infiniti M30d S delivers a compelling package for buyers seeking diesel luxury without premium pricing. Its powerful engine, tech-laden cabin, and balanced dynamics make it a credible alternative, earning four stars for relevance and execution.