Pulse Reviews and Analysis
Best Mercedes-Benz GLS Model Years (Ranked)
Curated by Kory White · Fractional CRO, CRO Syndicate
Best Mercedes-Benz GLS Model Years (Ranked)
The Mercedes-Benz GLS is the brand's flagship three-row SUV, the "S-Class of SUVs," offering seven-passenger luxury, available air suspension, and a range of powertrains from twin-turbo V6s and V8s to the mighty AMG GLS 63. Originally launched as the GL-Class (X164) in 2006 and renamed GLS in 2016, the model spans three distinct generations: X164, X166, and the current X167.
Buying used means weighing the proven but aging air suspension and 7G-Tronic concerns of older trucks against the polished tech and stronger reliability of recent ones. This ranking covers the best GLS and GL model years, their engines, the known issues to verify, and where the smart value lies on the used market today.
Direct Answer
The best overall Mercedes-Benz GLS is the 2020-2023 third-generation (X167) GLS 450, which pairs a smooth 3.0L inline-six with EQ Boost mild-hybrid, a genuinely opulent MBUX cabin, standard air suspension, and the most refined three-row package the nameplate has produced.
For shoppers focused on value, the best value is the 2017-2019 GLS 450 (X166), a 362-hp twin-turbo V6 flagship that delivers near-current luxury and space at a steep depreciation discount. Be cautious with high-mileage X164 GL-Class models and the AMG variants, where air suspension repairs, V8 maintenance, and 7-speed transmission service can be expensive.
Always confirm the air struts and Airmatic compressor are healthy before buying any GLS.
1. 2020-2023 GLS 450 (X167) 🏆 BEST OVERALL
The current-generation GLS 450 is the nameplate's high point. It rides on the MHA platform with standard Airmatic air suspension and a refined 3.0L turbocharged inline-six (M256) making 362 hp, aided by a 48-volt EQ Boost mild-hybrid system for seamless stop-start and torque fill.
The cabin is a triumph, with the dual-screen MBUX system, optional executive second-row seats, and a quiet, isolated ride.
Reliability is the strongest in GLS history, and the inline-six avoids the heavier maintenance of the V8s. Standard 4MATIC all-wheel drive, three usable rows, and a 9-speed automatic make this the GLS to buy if your budget reaches a recent used example.
2. 2017-2019 GLS 450 (X166) 💎 BEST VALUE
The facelifted X166 GLS 450 is the value champion. Renamed from GL to GLS in 2017, it uses a 3.0L biturbo V6 (M276) producing 362 hp paired with a 9-speed 9G-Tronic automatic, a meaningful upgrade over the earlier 7-speed. The cabin remains spacious and luxurious with three rows and standard 4MATIC.
The best value is a 2017-2019 GLS 450, which depreciation has made dramatically cheaper than the X167 while delivering most of the same luxury and capability. Watch the Airmatic air suspension and confirm service history, but a well-maintained example is the smart-money flagship pick for buyers who want maximum SUV for the money.
3. 2021-2023 GLS 580 (X167)
The GLS 580 adds a 4.0L twin-turbo V8 (M177) making 483 hp, again with 48-volt EQ Boost mild-hybrid assistance. It delivers effortless V8 thrust while retaining the same plush three-row cabin and Airmatic ride as the GLS 450. The mild-hybrid system improves smoothness and modestly helps fuel economy for a vehicle this size.
This is the powertrain to choose if you want strong V8 performance without stepping up to the fire-breathing AMG. Maintenance costs are higher than the inline-six 450, so budget accordingly. A clean, well-documented GLS 580 is a superb long-distance luxury hauler with genuine pace.
4. 2013-2016 GL 450 (X166)
The first GLS-generation truck (still badged GL-Class through 2016) introduced the X166 platform with a lighter body, better efficiency, and the 3.0L biturbo V6 rated around 362 hp by 2015. Earlier 2013-2014 GL 450 models used a 4.6L biturbo V8, while a strong GL 350 BlueTEC diesel was also offered.
These are well-rounded, comfortable three-row luxury SUVs at attractive used prices. Inspect the air suspension, 7G-Tronic transmission, and any diesel emissions/AdBlue history carefully. A clean GL 450 with documented service is a lot of luxury SUV for a modest outlay.
5. 2020-2023 Mercedes-AMG GLS 63 (X167)
The AMG GLS 63 is the performance flagship, packing a hand-built 4.0L twin-turbo V8 making 603 hp with EQ Boost, launching this seven-seat SUV to 60 mph in around 4.1 seconds. It adds AMG Active Ride Control, a sport-tuned 9-speed, and aggressive styling, all while keeping three rows.
This is a thrilling, exclusive choice, but it is the most expensive to run: tires, brakes, and V8 service are serious costs. Buy one only with full maintenance records and an inspection of the suspension and turbos. For a buyer who wants supercar pace with family practicality, nothing else in the lineup compares.
6. 2017-2019 GLS 550 (X166)
The X166 GLS 550 slots above the 450 with a 4.7L biturbo V8 producing 449 hp, delivering smooth, abundant power with the 9-speed automatic. It offers the same luxurious three-row cabin as the 450 with notably stronger acceleration and a more authoritative highway demeanor.
Depreciation makes these V8 flagships tempting, but the V8 carries higher fuel and maintenance costs than the V6 450. Verify the air suspension, check for oil leaks, and confirm service intervals were honored. A well-kept GLS 550 rewards the buyer who values effortless V8 power and is prepared for the running costs of a Mercedes V8.
7. 2013-2016 GL 350 BlueTEC Diesel (X166)
The GL 350 BlueTEC pairs a torque-rich 3.0L turbo-diesel V6 with the 7-speed automatic, returning the best fuel economy in the lineup and strong towing capability. It is a quiet, long-legged cruiser well suited to high-mileage owners who cover long distances.
The catch is diesel-specific maintenance: the AdBlue/SCR system, injectors, and emissions hardware must all be verified, and any emissions-related recall or service should be documented. These are durable engines when maintained, but neglected examples can be costly. For the right buyer who wants efficiency and torque in a three-row Mercedes, the BlueTEC diesel is a compelling, frugal option.
8. 2013-2016 GL 550 (X166)
The X166 GL 550 offered the 4.6L biturbo V8 with 429 hp before the GLS rename, giving the first-gen X166 truck genuine muscle. It combines strong acceleration with the platform's improved efficiency and refinement over the older X164, plus three-row luxury seating and standard 4MATIC.
As an older V8 flagship, it is now affordable but demands diligence: air suspension, turbochargers, and 7G-Tronic service all matter, and repair bills can be steep. Buy only with comprehensive records. For a buyer who wants V8 performance in a depreciated luxury SUV and budgets for upkeep, a clean GL 550 delivers a lot of capability per dollar.
9. 2010-2012 GL 450 (X164, Refreshed)
The refreshed first-generation GL-Class (X164) brought updated styling and improved interior materials, with the GL 450 using a 4.6L V8 (around 335 hp) and the 7-speed automatic. It established the formula of a true three-row, body-on-frame-adjacent luxury SUV with serious off-road and towing ability.
These are aging vehicles now, so inspect for air suspension faults, rust in salt-belt states, and worn-out electronics. The upside is very low pricing. A well-maintained X164 GL 450 makes a serviceable budget luxury hauler, but treat any neglected example with caution given how expensive Mercedes repairs can be.
10. 2007-2009 GL 320/350 CDI Diesel (X164)
The original GL-Class (X164) debuted for 2007, including the durable 3.0L CDI turbo-diesel (badged GL 320 CDI, later GL 350 BlueTEC). These early trucks offered impressive towing, real off-road hardware, and three rows, with strong torque from the diesel V6.
They are the oldest and least refined GLS-family vehicles, with the highest risk: air suspension, transmission, and diesel emissions components are all aged and potentially costly. There is little reason to seek one out except ruggedness or a very low price. Treat any survivor as budget transportation or a project, and have a Mercedes specialist inspect it thoroughly before purchase.
What to Watch For When Buying
The most important step when buying any used GLS or GL is to verify the air suspension is fully healthy. The Airmatic system uses air struts and a compressor that can fail with age, and replacement is expensive. Confirm the SUV sits level, raises and lowers correctly, and holds height overnight.
- Air suspension (Airmatic): Check for sagging corners, slow ride-height changes, or compressor noise; repairs can run into the thousands.
- Transmission: Older X164/early X166 trucks use the 7G-Tronic (verify smooth shifts); 2016+ models use the smoother 9-speed.
- V8 maintenance: GLS 550/580 and AMG 63 carry higher service, fuel, tire, and brake costs than the V6/inline-six 450.
- Diesel models (CDI/BlueTEC): Confirm AdBlue/SCR system, injectors, and any emissions recall service are documented.
- Recalls: Run the VIN through the NHTSA database and confirm any open recalls were addressed.
- Maintenance history: Documented Mercedes service records outweigh a low sticker price every time.
How to Choose
Match the GLS to your priorities. For the best blend of refinement, reliability, and technology, the 2020-2023 X167 GLS 450 is the answer, with its smooth inline-six and class-leading cabin. For the best value with proven luxury and space, a 2017-2019 GLS 450 is hard to beat thanks to steep depreciation.
Buyers wanting maximum V8 power should target a GLS 580 or, for thrills, the AMG GLS 63, while budgeting for higher running costs. Efficiency-focused, high-mileage drivers can consider a GL 350 BlueTEC diesel. In every case, prioritize a clean, documented service history and a thorough pre-purchase inspection of the air suspension.
FAQ
Which Mercedes-Benz GLS years are the most reliable? The current-generation 2020-2023 X167 GLS, especially the inline-six GLS 450 with EQ Boost, has the strongest reliability record. Older X164 GL-Class models carry the highest risk due to aging air suspension and electronics.
What is the difference between the GL and the GLS? They are the same model line. Mercedes sold it as the GL-Class from 2006 through 2016, then renamed it GLS beginning with the 2017 model year as part of its naming alignment. The X166 spans both names.
Is the air suspension a common problem on the GLS? Yes. The Airmatic air suspension is the most important thing to inspect on any used GLS or GL. Air struts and the compressor wear with age and can be costly to replace, so confirm the system holds height and operates correctly.
Which GLS is best for families on a budget? A 2017-2019 GLS 450 offers three rows, a luxurious cabin, the improved 9-speed automatic, and standard 4MATIC at a used price well below newer models, making it the smart budget flagship pick.
Bottom Line
The Mercedes-Benz GLS is a superb three-row luxury SUV, but air suspension health and powertrain choice make model-year selection critical. The 2020-2023 X167 GLS 450 is the best overall pick, with its refined inline-six and top-tier cabin, while the 2017-2019 GLS 450 offers the best value after depreciation.
Favor the V6/inline-six 450 for lower running costs, step up to the V8 580 or AMG 63 for performance, and always confirm the Airmatic system and service history through a pre-purchase inspection.
Sources
- Mercedes-Benz USA official GLS model history and specifications, mbusa.com
- NHTSA recall database for Mercedes-Benz GL and GLS, nhtsa.gov
- EPA Fuel Economy ratings for Mercedes-Benz GLS by model year, fueleconomy.gov
- Edmunds Mercedes-Benz GLS generation reviews and used-car appraisals, edmunds.com
- Kelley Blue Book Mercedes-Benz GLS used values by model year, kbb.com
- Car and Driver Mercedes-Benz GLS reviews and specifications, caranddriver.com
- Wikipedia Mercedes-Benz GLS-Class generations and technical specifications, en.wikipedia.org