The Mercedes GL-Class, spanning from the 2015 to the 2025 model years, represents the pinnacle of luxury SUV engineering, offering unparalleled comfort, advanced technology, and robust performance for discerning drivers.

The Mercedes-Benz GL-Class embodies a decade of automotive evolution, transforming from a well-appointed luxury SUV in 2015 to an even more sophisticated and technologically advanced machine by 2025. If you’re considering this esteemed vehicle, you’re looking at a lineage of ultimate luxury. Understanding what makes each model year special, from its initial debut to its most recent iterations, can feel like a journey in itself. Whether you’re a seasoned Mercedes-Benz owner or just beginning to explore the brand, this guide will illuminate the distinctive characteristics of the GL-Class across these model years, helping you appreciate its enduring appeal.

The Evolution of Grandeur: Mercedes GL-Class (2015-2025)

A Decade of Refinement: Understanding the GL-Class Lineage

The Mercedes-Benz GL-Class has always been more than just a large SUV; it’s a statement of arrival. Spanning from the 2015 model year to the anticipated 2025 iteration, this vehicle has consistently pushed the boundaries of luxury, comfort, and capability. For those seeking an imposing presence coupled with refined driving dynamics, the GL-Class offers a compelling proposition. This guide aims to demystify the evolution of this iconic model, highlighting key changes and enduring strengths that make each generation a worthy contender in the luxury SUV segment.

From its initial X166 generation to its subsequent evolution, the GL-Class (which was later renamed the GLS) has consistently been a flagship offering. We’ll explore the defining features that have cemented its reputation for offering an ultimate luxury experience across these crucial model years.

Key Model Year Milestones for the GL-Class

The journey of the GL-Class from 2015 to 2025 is marked by significant updates that enhanced its appeal and technological prowess. While the core philosophy of providing spacious, luxurious, and capable transportation remained constant, specific model years brought substantial changes.

The 2015 GL-Class: Building on a Solid Foundation

The 2015 GL-Class, part of the X166 generation, represented a peak of refinement for its era. It entered this year with a well-established reputation for providing ample passenger and cargo space, luxurious interiors, and a commanding presence on the road.

Powertrain Options: Typically offered with potent V6 and V8 engines, providing smooth yet robust power delivery. The GL 350 BlueTEC, with its diesel engine, offered an excellent blend of torque and fuel efficiency. The GL 450 and GL 550 featured gasoline V8s, delivering exhilarating performance.
Interior Excellence: The cabin was a sanctuary of high-quality materials, exquisite craftsmanship, and advanced features. Leather upholstery, elegant wood trim, and spacious seating for seven were standard, making long journeys a pleasure.
Technology and Safety: Features like the COMAND infotainment system, a rearview camera, and a suite of advanced driver-assistance systems (such as COLLISION PREVENTION ASSIST and ATTENTION ASSIST) were available, contributing to a safe and connected driving experience.

The Mid-Cycle Refresh: Enhancements That Mattered

Mercedes-Benz vehicles often undergo mid-cycle refreshes to keep them competitive. The GL-Class was no exception, with significant updates occurring in the lead-up to the latter half of this decade-long span.

The 2017 Model Year: A Significant Evolution Before the Name Change

While the renaming to GLS occurred for the 2017 model year, the 2017 GL-Class represented a substantial update before that official designation. This year saw a notable redesign, particularly in its front fascia, updated powertrain options, and enhanced technology integration.

Exterior Styling Updates: The 2017 GL adopted a more contemporary look with a redesigned grille, headlights, and bumpers, aligning it with Mercedes-Benz’s then-current design language.
Powertrain Advancements: A notable change was the introduction of a more powerful and efficient 3.0-liter biturbo V6 engine for the GL 450, replacing the previous naturally aspirated V8. The GL 350 BlueTEC continued to offer its efficient diesel power.
Interior Refinements: The interior received subtle but impactful updates, including a revised instrument cluster and enhanced COMAND infotainment system with improved graphics and functionality.

The Birth of the GLS: A New Era Dawns

The renaming of the GL-Class to the GLS for the 2017 model year signified a shift in Mercedes-Benz’s nomenclature, bringing its SUV naming in line with its sedan counterparts (e.g., GLE for the M-Class, GLE Coupe for the ML Coupe). The GLS designation essentially meant it was the “S-Class of SUVs,” emphasizing its top-tier luxury positioning.

The 2017-2019 GLS: The Foundation of the New Identity

These years established the GLS as the definitive full-size luxury SUV from Mercedes-Benz, continuing the legacy of the GL-Class with a blend of comfort, space, and technology.

Continued Powertrain Excellence: The 2017-2019 GLS models offered a range of AMG-tuned powertrains for those seeking ultimate performance, alongside the more comfort-oriented V6 and V8 options.
Focus on Comfort and Space: The hallmark of the GLS remained its cavernous interior, offering generous legroom for all occupants, including those in the third row, and substantial cargo capacity.
Enhanced Safety and Entertainment: Advanced safety features were more standard or widely available, and the infotainment system continued to evolve for a seamless digital experience.

The 2020 Refresh: A Leap into Modern Luxury

The 2020 model year brought a comprehensive redesign to the GLS (X167 generation), marking one of the most significant updates in its history. This was not just a facelift; it was a reimagining of what a large luxury SUV could be.

Revolutionary Exterior Design: The 2020 GLS featured a much sleeker, more aerodynamic, and aesthetically pleasing design. The grille became more prominent, headlights were updated, and the overall silhouette was more sculpted and modern.
Interior Transformation: The cabin underwent a dramatic overhaul, becoming even more luxurious and technologically advanced. It adopted Mercedes-Benz’s latest interior design language, featuring a large dual-screen display that integrated the digital instrument cluster and infotainment system. High-quality materials, ambient lighting, and advanced climate control created an unparalleled sense of opulence.
New Powertrain Technologies: The introduction of mild-hybrid technology (EQ Boost) with its inline-six and V8 engines provided smoother acceleration, improved efficiency, and an electric “boost” function. The 48-volt electrical system was a key innovation.
Advanced Driver Assistance Systems (ADAS): The 2020 GLS significantly enhanced its ADAS suite, offering semi-autonomous driving capabilities in certain situations, adaptive cruise control, lane-keeping assist, and more sophisticated parking systems.

The 2021-2024 GLS: Refinements and AMG Dominance

Following the major overhaul in 2020, the subsequent model years (2021-2024) have focused on refining this already exceptional package and expanding the performance offerings within the AMG division.

Performance Augmentation (AMG): The AMG GLS 63 and the even more powerful AMG GLS 63 S models became the titans of performance in the lineup, offering hand-built V8 engines with staggering horsepower and torque, advanced suspension systems, and a driving experience that belied the vehicle’s size.
Continued Technology Integration: Incremental updates to the MBUX (Mercedes-Benz User Experience) infotainment system further enhanced its capabilities, including improved voice control, navigation, and connectivity options.
Comfort and Customization: Mercedes-Benz continued to offer a vast array of luxury options and customization packages, allowing buyers to tailor their GLS to their exact preferences, from premium sound systems to deluxe seating configurations.

The Anticipated 2025 GLS: The Future of Luxury SUV

While specific details for the 2025 model year are often revealed closer to its release, one can anticipate Mercedes-Benz to continue its relentless pursuit of innovation. Based on current trends and the established trajectory of the GLS, we can expect:

Electrification Focus: Further integration of mild-hybrid or potentially plug-in hybrid powertrains. Mercedes-Benz has a stated goal of electrifying its model range, and the GLS will undoubtedly play a significant role.
Advanced Technology: Expect next-generation MBUX features, potentially incorporating augmented reality navigation, more sophisticated AI-driven voice commands, and enhanced connectivity services.
Design Evolution: Subtle exterior and interior styling updates to maintain a fresh and modern aesthetic, possibly influenced by emerging Mercedes-Benz design cues like the EQ series.
Enhanced Safety and Driver Assistance: Further development of autonomous driving features and advanced safety technologies to set new benchmarks in the segment.

Key Features Across the 2015-2025 GL-Class/GLS Spectrum

Throughout this decade, certain hallmark features have defined the GL-Class/GLS experience.

Spacious and Versatile Interior

One of the most compelling reasons to choose a GL-Class or GLS is its interior space.

Three Rows of Seating: All models reliably offer seating for up to seven passengers, with a third row that is genuinely usable for adults on shorter journeys.
Generous Cargo Volume: When the rear seats are folded, the cargo space is expansive, making it ideal for family trips, large shopping hauls, or transporting sports equipment.
Premium Materials: Expect high-grade leather, real wood or metal trims, and meticulous fit-and-finish throughout the cabin, consistent with Mercedes-Benz’s luxury ethos.

Advanced Powertrains

Mercedes-Benz has always offered a diverse range of engines to suit different needs.

Diesel Efficiency (GL 350 BlueTEC): For the earlier years, the GL 350 BlueTEC offered remarkable fuel economy for such a large vehicle, coupled with robust torque.
Smooth V6 and Potent V8s: GL 450 and GL 550 models provided a balance of performance and refinement with their V6 and V8 gasoline engines.
Mild-Hybrid Integration (EQ Boost): From the 2020 refresh onwards, mild-hybrid technology became a key feature, enhancing responsiveness and efficiency.
AMG Powerhouses: The AMG GLS 63 and GLS 63 S models are the performance kings, offering handcrafted V8 engines with immense power figures, a performance-tuned suspension, and aggressive styling.

Cutting-Edge Technology

From infotainment to driver assistance, the GL-Class/GLS has consistently been at the forefront.

COMAND and MBUX Infotainment: The evolution from the COMAND system to the more intuitive and visually stunning MBUX system with its dual-screen setup has been a defining technological leap.
Driver Assistance Suites: Features like adaptive cruise control (DISTRONIC PLUS), lane keeping assist, blind-spot monitoring, and emergency braking have become increasingly sophisticated, enhancing safety and reducing driver fatigue.
Connectivity: Enhanced Bluetooth, smartphone integration (Apple CarPlay, Android Auto), and advanced navigation systems ensure you’re always connected and informed.

Comfort and Convenience Features

Luxury at this level is defined by the details that enhance comfort and ease of use.

Multi-Zone Climate Control: Ensuring personalized comfort for all passengers.
Heated and Ventilated Seats: Standard on most trims, with massaging functions often available as options.
Power-Adjustable Seating with Memory: Allowing for easy adjustment and recall of preferred driving positions.
Panoramic Sunroof: Providing an open and airy cabin feel.
Harman Kardon or Burmester Sound Systems: Delivering an exceptional audio experience.

Performance and Driving Dynamics

While primarily a luxury cruiser, the GL-Class/GLS never shied away from offering engaging performance, especially in its AMG variants.

The Standard GLS Experience

Even the base models offer a serene and composed ride, thanks to sophisticated suspension systems. The air suspension (AIRMATIC) is particularly noteworthy, adapting to road conditions and loads to provide a buttery-smooth ride and maintain optimal vehicle height. Steering is precise, and body roll is remarkably well-controlled for a vehicle of its size, thanks to advanced chassis engineering.

AMG GLS: Unleashing the Beast

The AMG models are a different breed entirely. They feature:

Hand-Built Engines: The AMG 4.0-liter V8 biturbo engine is a masterpiece of engineering, delivering explosive acceleration.
Performance-Tuned Suspension: AMG RIDE CONTROL+ suspension with active roll stabilization ensures exceptional handling and grip.
Upgraded Braking Systems: Larger, high-performance brakes provide confidence-inspiring stopping power.
Dynamic Driving Modes: Allowing drivers to tailor the vehicle’s response from comfort-oriented to track-focused aggression.

Choosing Your GL-Class/GLS: Key Considerations

When looking at models from 2015 to 2025, several factors will influence your choice.

Model Year and Budget

2015-2016 GL-Class: These models offer a taste of classic GL luxury at a more accessible price point. They are well-equipped and provide a premium experience.
2017-2019 GLS: These represent the first iteration of the GLS nameplate, featuring the mid-cycle refresh updates. They offer a modern design and improved tech over the pre-2017 GL models.
2020+ GLS: This generation (X167) is a significant leap forward in terms of design, technology (MBUX), and powertrain innovation (EQ Boost). These models command a higher price but offer the most contemporary luxury experience.
AMG Variants: If performance is a priority, budget for the higher price tag and potential increased running costs associated with AMG models.

Engine and Drivetrain

For Fuel Efficiency: The GL 350 BlueTEC (older models) is a strong contender. Newer models with EQ Boost offer slightly better economy for their power output.
For Balanced Performance: GL 450/GLS 450 models with V6 or inline-six engines provide an excellent blend of power and refinement.
For Maximum Power: GL 550/GLS 550 and especially AMG variants deliver exhilarating acceleration.
4MATIC All-Wheel Drive: This is standard on most newer GLS models and was widely available on previous GL variants, providing enhanced traction and stability in varying conditions.

Features and Options

Technology: Decide if you need the latest MBUX system or if the COMAND system suffices. Consider desired features like premium audio, rear-seat entertainment, or advanced driver assistance packages.
Comfort: Look for desirable features like multi-contour seats with massage functions, heated and ventilated rear seats, and advanced climate control options.
Exclusivity: Consider packages like the designo® line for bespoke interiors or specific AMG styling kits.

Maintenance and Ownership Tips

Owning a Mercedes-Benz GL-Class or GLS is an investment in luxury, and proper maintenance ensures its longevity and performance.

Adhere to the Maintenance Schedule: Consult your owner’s manual for Mercedes-Benz’s recommended service intervals. Regular oil changes, filter replacements, and fluid checks are crucial.
Choose Reputable Service Centers: While independent specialists can be skilled, for complex issues or warranty work, authorized Mercedes-Benz dealerships are often the best choice. For DIY enthusiasts, ensure you have the right tools and parts, or consult resources like the Mercedes-Benz USA Owner’s Site for manuals and support.
Tire Care: Given the vehicle’s weight and performance capabilities, proper tire inflation, alignment, and timely replacement are critical for safety and handling.
Fluid Checks: Regularly check essential fluids like coolant, brake fluid, and windshield washer fluid.
* Battery Health: Modern Mercedes-Benz vehicles rely heavily on their electrical systems. Ensure your battery is in good condition, especially in colder climates.

Frequently Asked Questions

What is the main difference between the 2015 GL-Class and a 2020+ GLS?

The most significant differences are the name change to GLS for 2017 and the complete redesign for the 2020 model year. The 2020+ GLS features a more modern exterior and interior design, the advanced MBUX infotainment system, and the introduction of mild-hybrid EQ Boost technology, offering a more contemporary luxury and technology experience compared to the 2015 GL-Class.

Are all GL-Class/GLS models 7-seaters?

Yes, typically all models across the 2015-2025 spectrum are configured with three rows of seating, accommodating up to seven passengers.

What does the “EQ Boost” feature do on newer GLS models?

EQ Boost is a 48-volt mild-hybrid system. It assists the engine during acceleration, provides smoother start/stop functions, and powers ancillary systems, improving efficiency and responsiveness without the significant weight or complexity of a full hybrid system.

Are earlier GL-Class models reliable?

While older vehicles can have more potential for maintenance needs, the GL-Class and its successor, the GLS, are generally built to high standards of quality and durability. Following recommended maintenance schedules is key to ensuring reliability.

What is the best engine option for the GL-Class/GLS?

This depends on your priorities. For fuel efficiency in older models, the GL 350 BlueTEC diesel is excellent. For a balance of power and refinement, the GL 450/GLS 45