Mercedes-Benz GLS
X167
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Based on aggregated real-world data across engine, drivetrain, and electronics.
The Mercedes-Benz GLS (X167) is a full-size luxury SUV produced from 2019 onwards. As the S-Class of SUVs, it offers three-row seating and flagship comfort levels.
Technical Reliability Analysis
Reliability Analysis: Mercedes-Benz GLS (X167, 2019-Present) – Non-Engine Components
The Mercedes-Benz GLS X167 is the brand's flagship SUV, offering S-Class levels of luxury in a three-row package. Built on the same MHA platform as the GLE, it shares many components but adds significant complexity with its size and features. Reliability is generally acceptable for a vehicle of this class, but running costs are substantial. The Airmatic air suspension is standard and represents a major potential repair cost. Electronics are complex with multiple screens and driver assistance systems that can be costly to repair.
Common Issues
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Airmatic Suspension: Standard air suspension is prone to leaks and compressor failures; repairs are very expensive
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Electronics: Multiple screens and complex systems increase failure risk; software glitches are not uncommon
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Running Costs: Everything costs more on a GLS - tires, brakes, suspension components
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48V System: Mild-hybrid components add complexity and potential failure points
Build Quality
Interior quality is excellent with premium materials throughout. The vehicle feels solid and well-built, though the complexity of systems means more potential for issues. Paint and bodywork are of high quality.
Maintenance & Care Tips
Immediate Maintenance Steps After Purchasing a Used Mercedes-Benz GLS (X167)
The GLS X167 is a complex flagship SUV with significant running costs. Proper maintenance is essential to avoid astronomical repair bills.
Priority Actions:
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Full Inspection: Essential pre-purchase inspection by Mercedes specialist
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Airmatic Check: Test all suspension functions thoroughly; any issues are expensive
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Software Updates: Verify all modules have latest software
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48V Battery: Check health on mild-hybrid models
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Service History: Verify all maintenance up to date; missing services are red flags
Service Intervals:
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Oil change: Every 10,000 miles or annually
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Brake fluid: Every 2 years
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Transmission service: Every 60,000 miles
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Differential fluids: Every 60,000 miles
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Spark plugs: Every 40,000-60,000 miles (petrol)
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Air filters: Every 20,000 miles
The Final Verdict
Verdict: Conditionally Recommended
The GLS offers incredible space and luxury but demands deep pockets for maintenance. The Airmatic suspension is a major cost risk. Only recommended for buyers who genuinely need three rows of luxury and can budget for premium upkeep.
Frequently Asked Questions
How reliable is the Mercedes-Benz GLS (X167)?
Which engines are recommended?
Is this model a good buy?
Reliable Engines for this model
Overall reliability depends heavily on the specific engine choice. A great car with a problematic engine can still be a risky purchase. Cross-reference the reports above.