The best Mercedes-Benz GLS years are 2019 and 2022. The 2019 model offers proven reliability from the previous generation, while 2022 provides updated technology with fewer first-year redesign issues. Buyers should approach the 2020 model year carefully due to complex new electronics.
Rankings are comparative, and no luxury SUV is entirely flawless. Proper maintenance, service history, and a thorough pre-purchase inspection remain essential for long-term ownership satisfaction and reliability.
Meaningful differences exist between generations and powertrains. The transition to the newer X167 generation introduced a 48-volt mild-hybrid system and advanced infotainment, which require specific diagnostic checks compared to older models.
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Best and Worst Mercedes-Benz GLS Years at a Glance
| Model Year | Verdict | Main Reason | Buyer Guidance |
|---|---|---|---|
| 2017 | Good Choice | Solid but aging platform. | Inspect air suspension. |
| 2018 | Good Choice | Carryover year with consistent performance. | Verify maintenance records. |
| 2019 | Best Older Choice | Final year of the X166 generation, highly reliable. | Top pick for budget buyers. |
| 2020 | Approach Carefully | First year of X167 redesign, complex new electronics. | Check 48V system and MBUX. |
| 2021 | Good Choice | Improved software, but still early in the generation. | Review warranty status. |
| 2022 | Best Late-Generation Choice | Refined technology and better initial build quality. | Best pick for modern features. |
| 2023 | Good Choice | Minor updates, strong performance. | Confirm recall completion. |
| 2024–2025 | Too New to Judge | Latest model years, insufficient long-term data. | Rely on warranty coverage. |
Key Takeaways
- 2019 and 2022 are the strongest choices for used buyers.
- The 2020 model year requires careful inspection of new electronic systems.
- Air suspension and 48-volt mild-hybrid components are the main cost concerns.
- Always verify open recalls and complete service history before purchasing.
- Recent models lack long-term ownership data, making warranty coverage vital.
How We Evaluated the Mercedes-Benz GLS Model Years
Our analysis compares official recalls, manufacturer service campaigns, and consumer complaint patterns. We evaluate powertrain changes, generation redesigns, and the severity of recurring issues across all Mercedes-Benz model years.
Complaint totals are not confirmed failure rates, and a recall does not automatically make a vehicle unreliable. Recent model years have limited long-term exposure, meaning “best” indicates comparatively stronger evidence rather than absolute perfection.
Best Mercedes-Benz GLS Years
2019 (Best Older Choice)
The 2019 model represents the final year of the X166 generation. By this point, Mercedes-Benz had resolved most earlier mechanical and electrical gremlins, resulting in a comparatively mature and stable luxury SUV.
Buyers seeking a more traditional driving experience without the complexity of newer mild-hybrid systems will find the 2019 GLS appealing. However, inspect the air suspension components for wear, as they are a known maintenance item.
2022 (Best Late-Generation Choice)
The 2022 GLS belongs to the X167 generation but benefits from early-production software and hardware revisions. The MBUX infotainment system and 48-volt EQ Boost mild-hybrid system operate more reliably than in the debut year.
This year offers a strong balance of modern luxury, advanced safety features, and improved build quality. Verify that all software updates have been applied by a certified dealer to ensure optimal system performance.
Best Year by Buyer Type
Best Overall
The 2022 model year provides the best combination of modern technology, refined powertrains, and resolved first-year redesign issues for buyers wanting a current-generation luxury SUV.
Best Budget Option
The 2019 model year is ideal for buyers wanting a reliable, fully depreciated luxury SUV without the added complexity and repair costs of the newer 48-volt electrical architecture.
Years to Approach Carefully
2020 (Approach Carefully)
The 2020 model year marks the complete redesign to the X167 platform. First-year redesigns often introduce unexpected software bugs, and the 2020 GLS is no exception, particularly regarding the new MBUX interface.
Additionally, the introduction of the EQ Boost 48-volt mild-hybrid system brought early reports of battery and electrical sensor issues. Buyers should only consider this year if comprehensive service records and extended warranty coverage are available. For more models requiring caution, browse our years to avoid guides.
Mercedes-Benz GLS Reliability by Generation
X166 Generation (2017–2019)
Originally launched as the GL-Class, this generation was renamed GLS in 2017. These models are known for robust engine options and traditional hydraulic steering, but they require strict adherence to maintenance schedules.
Air suspension leaks and transfer case wear are the primary mechanical concerns. If you are also researching other Mercedes-Benz vehicles, our guides on the Mercedes-Benz S-Class, Mercedes-Benz SL, Mercedes-Benz SLK and Mercedes-Benz Sprinter cover their respective best and worst years.
X167 Generation (2020–Present)
The current generation features a highly digital cabin, advanced driver assistance systems, and a 48-volt mild-hybrid setup. While offering superior ride quality and technology, the complex electrical architecture demands specialized diagnostic equipment.
Late-production years like 2022 and 2023 show improved reliability as initial software and hardware flaws were addressed. For related luxury SUVs, you may also want to research the Mercedes-Benz GLE or the rugged Mercedes-Benz G-Class.
Common Mercedes-Benz GLS Problems
Air Suspension Failures
The Airmatic suspension system provides a smooth ride but is prone to air leaks and compressor failures, particularly on models with higher mileage. Symptoms include a sagging corner or a dashboard warning message.
Replacing air struts or the compressor is an expensive repair. Buyers should test the suspension by raising and lowering the vehicle during a pre-purchase inspection to check for proper operation.
48-Volt Mild-Hybrid System Issues
Introduced with the X167 generation, the EQ Boost 48-volt system assists with acceleration and start-stop functions. Early models experienced software glitches, sensor failures, and premature battery degradation.
These issues can trigger a limp-home mode or prevent the vehicle from starting. Ensure all technical service bulletins related to the 48-volt system have been completed by a dealership.
MBUX Infotainment Glitches
The Mercedes-Benz User Experience (MBUX) system relies on complex software that can occasionally freeze, reboot, or fail to connect to smartphones. Black screens and unresponsive touchpads are the most common complaints.
Most of these issues are resolved through over-the-air or dealer-installed software updates. Verify the system’s software version and test all connectivity features before finalizing a purchase.
What to Check Before Buying a Used Mercedes-Benz GLS
- Verify the VIN for any open safety recalls or official service campaigns.
- Review the complete service history to confirm regular maintenance intervals.
- Test the Airmatic suspension by cycling through all ride height settings.
- Scan the vehicle for stored diagnostic codes, especially in the 48-volt system.
- Inspect the sunroof drains to ensure they are clear and prevent water intrusion.
- Check the condition of the transfer case fluid and listen for unusual whining noises.
- Arrange an independent pre-purchase inspection with a certified Mercedes-Benz technician.
Related Buying Guides
- Mercedes-Benz GLE best and worst years: The GLE offers a similar luxury experience in a slightly smaller, two-row package.
- Mercedes-Benz G-Class best and worst years: The G-Class provides unmatched off-road capability and iconic styling for buyers prioritizing ruggedness over on-road comfort.
- Mercedes-Benz GLC best and worst years: The GLC is a practical alternative for buyers who need luxury but prefer a more manageable, compact footprint.
- Mercedes-Benz GL best and worst years: Research the predecessor to the GLS to understand the lineage and common issues of older three-row models.
Frequently Asked Questions
What is the most reliable Mercedes-Benz GLS year?
The 2019 model year is widely considered the most reliable, as it is the final and most refined year of the X166 generation before the major platform redesign.
Should I avoid the 2020 Mercedes-Benz GLS?
You should approach the 2020 model year carefully. As the first year of the X167 redesign, it experienced early software and 48-volt mild-hybrid system issues that were improved in later years.
Do Mercedes-Benz GLS models have air suspension problems?
Yes, the Airmatic suspension is a known maintenance item across multiple generations. Air struts and compressors can fail over time, leading to costly repairs and a sagging ride height.
Is the Mercedes-Benz GLS expensive to maintain?
As a full-size luxury SUV, the GLS carries higher-than-average maintenance and repair costs. Routine services and complex electronic or suspension repairs require specialized parts and certified technicians.
What is the difference between the GL and GLS?
Mercedes-Benz renamed the GL-Class to the GLS-Class in 2017 to align with their new naming strategy. The underlying X166 platform remained largely the same until the 2020 redesign.
How long do Mercedes-Benz GLS SUVs typically last?
Longevity depends heavily on strict maintenance and repair history. Well-maintained examples can reach high mileage, but deferred maintenance on complex systems like the air suspension will drastically reduce the vehicle’s lifespan.
Choosing the Right Mercedes-Benz GLS Model Year
The 2019 and 2022 model years offer the strongest ownership experiences for used buyers. The 2019 model provides proven reliability, while 2022 delivers refined modern technology.
Avoid rushing into a 2020 model without a thorough inspection of its electrical systems. Always verify the VIN for open recalls, review maintenance records, and secure an independent inspection before purchasing.
