2020 Mercedes-Benz Gls Reliability ReportC+ grade · moderate risk · system-by-system breakdown
Quick Facts · 2020 Mercedes-Benz Gls
- The system most likely to surface first: air suspension (airmatic/e-active body control) (major severity).
- No active NHTSA safety recalls on record — a clean recall slate for the 2020 model year.
- Scores 4 points below the strongest nearby year — the 2022 Mercedes-Benz Gls earns a 82.
Is the 2020 Mercedes-Benz Gls Worth Buying?
The 2020 Mercedes-Benz GLS is a magnificent luxury SUV, offering an unparalleled blend of comfort and technology. However, its sophisticated systems introduce a higher level of complexity and maintenance demands than the average vehicle, leading to elevated ownership costs and a moderate risk profile for the discerning used buyer. Prepare for premium upkeep to truly enjoy its grandeur.
The 2020 Mercedes-Benz GLS offers a truly opulent driving experience, but it demands a significant financial commitment beyond the purchase price. Its advanced technology and complex mechanical systems, particularly the air suspension and 48V mild-hybrid, present known points of failure that can lead to substantial…
Best Model Years
2021 onwards (minor refinements to MBUX software and 48V system)
Years to Avoid
None explicitly, but early 2020 models may have more initial MBUX glitches which should be resolved via updates.
Biggest Strengths
- Exceptional build quality and materials
- Robust core engine and transmission (when maintained)
- Advanced safety and driver-assist systems
What Tends to Fail First on the 2020 Mercedes-Benz Gls
The systems that tend to fail first on the 2020 Mercedes-Benz Gls, with the typical mileage window when each becomes a concern. Detailed repair-cost ranges and exact what-to-check inspection notes are in the full report.
The sophisticated air suspension system, while offering an incredible ride, is prone to component failures such as air spring leaks, compressor issues, or sensor malfunctions. These often lead to a sagging stance or error messages and ar…
The integrated starter-generator and 48V battery, which powers the EQ Boost mild-hybrid system, can experience failures. Issues range from intermittent warning lights to complete loss of power or inability to start, requiring expensive c…
The advanced MBUX system, with its multiple screens and voice control, can suffer from software glitches, freezing, random reboots, or unresponsive touch/trackpad inputs. Sensor failures related to parking assist, driver aids, or lightin…
2020 Mercedes-Benz Gls Mileage Danger Zones
The mileage windows when the 2020 Mercedes-Benz Gls most commonly needs attention. Plan ahead, budget accordingly, and inspect before you cross each threshold.
Low Risk Zone / Initial Service
At this mileage, the GLS is still relatively new. Focus will be on routine maintenance (oil, filters) and addressing any initial MBUX software bugs or minor sensor glitches, often covered under original warranty.
Maintenance & Wear Zone
This mileage typically triggers major service intervals, including transmission fluid changes, spark plugs (V8), and possibly front brakes. Air suspension components may start showing early signs of wear.
Elevated Risk Zone
Beyond the 90k mark, the risk of significant component failures increases. Air suspension issues become more prevalent, and the 48V mild-hybrid system on EQ Boost models needs careful monitoring. More costly services are expected.
High Risk Zone / Major Component Review
At this mileage, expect potential major expenses. Air suspension components may require complete overhaul, and comprehensive inspection of engine, transmission, and all electrical systems for wear and impending failure is crucial. Major…
2020 Mercedes-Benz Gls Ownership Cost Outlook
What it typically costs to keep the 2020 Mercedes-Benz Gls on the road. Full 5-year cost-of-ownership projection and major-failure-risk forecast are in the report.
Annual Maintenance
$1,000-1,500 (excluding major repairs)
Moderate Repairs
$1,500-3,000 occasionally (e.g., brake overhaul, sensor replacement)
How Long Does the 2020 Mercedes-Benz Gls Last?
For a 2020 GLS, aim for a vehicle with under 60,000 miles to maximize remaining component life and avoid immediate major maintenance items. Be wary of vehicles near or over 90,000 miles unless comprehensive service records and recent major repairs (e.g., air suspension) are provided.
What 2020 Mercedes-Benz Gls Owners Actually Say
What Owners Love
- Exceptional ride comfort and quietness, even on long journeys.
- Luxurious interior with high-quality materials and exquisite craftsmanship.
- Cutting-edge technology and MBUX infotainment system (when working seamlessly).
- Powerful engine options providing effortless acceleration for a large SUV.
Common Frustrations
- Very high maintenance and repair costs, often requiring dealer-specific tools.
- MBUX infotainment system can be buggy, slow, or difficult to master for some.
- Fuel economy is poor, especially with the V8 engine.
- Rapid depreciation, especially in the first few years.
Who Should Buy the 2020 Mercedes-Benz Gls?
Best For
- Buyers prioritizing ultimate luxury, comfort, and advanced technology.
- Families needing significant space and a refined ride for long trips.
- Individuals who understand and are prepared for high-end luxury vehicle maintenance costs.
Not Ideal For
- Budget-conscious buyers seeking minimal running costs and high fuel efficiency.
- DIY mechanics, as specialized tools and diagnostics are often required.
How the 2020 Mercedes-Benz Gls Compares to Rivals
The GLS stands toe-to-toe with its German rivals in terms of luxury, technology, and performance, sharing similar complex system risks. It generally surpasses more traditional luxury SUVs in refinement but cannot match the legendary reliability and lower running costs of Japan…
More Reliable Than
- Range Rover (older generations for overall electrical/air suspension reliability)
- Cadillac Escalade (for interior quality and overall refinement)
Comparable To
- BMW X7
- Audi Q7/Q8
2020 Mercedes-Benz Gls Recall History
No active NHTSA safety recalls on file for the 2020 Mercedes-Benz Gls. Always verify with your VIN atnhtsa.gov.
What breaks on the 2020 Mercedes-Benz Gls?
Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.
OwnerKeep Passport · $499 · one-time
Just bought a 2020 Mercedes-Benz Gls? Keep it that way.
Snap a receipt — AI logs it. Build an OwnerScore. Sell with a buyer-ready Passport dossier.
Other Mercedes-Benz Gls Years to Consider
Compare KeepScores across nearby years of the Mercedes-Benz Gls. Click any year for its full report.
2020 Mercedes-Benz Gls Alternatives
Similar class, similar year range — ranked by KeepScore.
Relevant Products for Your 2020 Mercedes-Benz Gls
Parts and accessories matched to your 2020 Mercedes-Benz Gls
As an Amazon Associate I earn from qualifying purchases.
Frequently Asked Questions
Just bought a 2020 Mercedes-Benz Gls? Keep it that way.
OwnerKeep Passport turns your Mercedes-Benz Gls's care history into a luxury digital vault — AI-logged receipts, an OwnerScore that pays at resale, and a buyer-ready dossier in one tap.
- AI receipt OCR — snap and log
- Fuel & mileage tracker
- Tri-Score OwnerScore
- One-tap resale dossier PDF
Recommended Reading for the Mercedes-Benz Gls
Most Reliable Cars to Buy Used (Top 10 Ranked)
Get our expert-ranked list of the 10 most reliable used cars you can buy today, saving money and avoiding future headaches with smart choices.
Jeep Wrangler vs Toyota 4Runner: Which Lasts Longer?
Get the definitive answer: Which truly lasts longer, the Jeep Wrangler or Toyota 4Runner? Our comparison reveals their long-term durability.
Toyota Tacoma vs Chevy Colorado: Reliability Compared
Explore a head-to-head reliability comparison of the Toyota Tacoma vs. Chevy Colorado. Discover which truck truly stands out for long-term dependability.