Photo: IFCAR / Public domain / Wikimedia Commons
Every generation
Power
0–62 mph (0–100 km/h)
Top speed (250 km/h)
Combined, EPA 2016
What owners say
Our take, from owner reports
Sentiment is mixed and heavily dependent on model year, engine choice, and ownership expectations.
8 problems reported (2 very frequent, 4 recurrent, 2 isolated) · high confidence
Problems owners report
- Very frequentAir suspension failure
Components like the pump and air springs fail, leading to expensive repairs (quoted at ~$5k minimum).
- Very frequentHigh maintenance and repair costs
Routine servicing, parts (e.g., brakes, tires), and repairs are significantly more expensive than mainstream brands; described as "flagship maintenance costs.".
- RecurrentElectronic system failures
Flaky blind-spot monitoring, lane departure warnings, infotainment issues, and power seat malfunctions.
+ 5 more issuesShow fewer
- RecurrentEngine and transmission mount wear
Causes shuddering or vibration, especially at higher mileage (e.g., 80k+ miles).
- RecurrentIntake manifold issues (M272 V6)
Failure due to oil separator problems gumming up flaps; requires replacement.
- RecurrentCooling system problems
Leaking or bursting coolant hoses and radiator issues, leading to overheating.
- IsolatedUnreliable power liftgate
Problems with latches, handles, and obstruction sensors.
- IsolatedRapid tire and brake wear
Owners report almost annual replacement of tires and brake pads due to vehicle weight.
The version owners recommend
For the X166 generation (2013-2019), the facelift models (2017-2019) are frequently recommended for their updated and more reliable engines (M276 turbo V6, updated M278 V8). The GLS550 (V8) is highlighted as providing an ideal blend of smooth, abundant power and luxury, described as "one of the best full-size 3 row crossover experiences." The non-AMG body style with standard 20-inch wheels is preferred over AMG-line models with larger wheels for a better ride quality and lower tire replacement costs.
Competitors to consider
Owners compare it most often with the Lexus LX, Audi Q7, BMW X7, Range Rover and Ford Expedition.
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Overall sentiment
Sentiment is mixed and heavily dependent on model year, engine choice, and ownership expectations. The X164 generation (pre-2013) is described as a "dinosaur" with a less refined driving experience but is noted for its non-turbo engine reliability. The facelifted X166 generation (2013-2019) is widely praised for its significant improvements in driving dynamics, comfort, and interior quality, offering a "magic carpet" ride with its adaptive air suspension. Owners appreciate the vehicles as powerful, comfortable, and spacious family haulers with a premium feel. However, consensus is strong that these are flagship vehicles with flagship maintenance costs. Reliability concerns are recurrent, particularly with complex systems like air suspension and electronics, and long-term ownership beyond warranty is described as financially risky. Satisfaction is high for those who value comfort and capability and who maintain the vehicle meticulously, but significant frustration is reported by those who experience costly, repeated failures.
Positioning vs competitors
Positioned as a premium, comfortable, and capable full-size three-row SUV. Compared to mainstream American competitors like the Ford Expedition, it is seen as offering superior ride quality, interior refinement, and a more car-like driving experience, but at a significantly higher cost of ownership. Against other German rivals like the Audi Q7 and BMW X7, it is often noted for its more traditional, truck-like presence and superior towing capacity (in earlier generations). Compared to Lexus models (LX, GX), it is viewed as more engaging to drive and more modern but less reliable long-term. The consensus is that it trades some long-term durability for a higher level of luxury and driving sophistication.
Recommended configurations
A model with a remaining factory Certified Pre-Owned (CPO) warranty is strongly and frequently recommended as essential for financial protection. The V8 engine (550 models) is recommended for those seeking superior power and smoothness, while the V6 (450 models) is noted as more fuel-efficient and adequate for most. All-wheel drive is assumed. Avoiding the exterior "night package" is suggested due to reports of faded black trim. Choosing a reputable independent European specialist mechanic for maintenance is advised to control costs. Using premium fuel and specific manufacturer-approved fluids (e.g., 85W-90 GL-5 gear oil for certain differentials) is emphasized.
General recommendations
Only purchase with a comprehensive warranty (CPO is ideal) and plan to own primarily within the warranty period. Suitable for buyers who prioritize luxury, space, and comfort over lowest cost of ownership and who can budget for high routine maintenance and potential repairs. Not recommended for budget-conscious buyers or those seeking a low-maintenance, high-mileage vehicle without warranty coverage. A pre-purchase inspection by a specialist is critical, with focus on air suspension components, engine mounts, transmission service history, and electronic systems. For used models, target lower-mileage examples with complete service records. Be prepared for high costs for tires, brakes, and premium fuel.
Remarks
Owner feedback clearly delineates between the X164 and X166 generations, with the latter being the focus of most discussions. The M276 V6 (in 450 models) and the updated M278 V8 (in 550 models post-2016) are highlighted as reliable powertrains, but the vehicle's overall cost of ownership is the dominant theme. The necessity of a warranty cannot be overstated in community feedback. There is an explicit warning against purchasing examples with multiple previous owners in a short time frame, as it may indicate underlying problems. The data suggests that well-maintained examples can reach high mileage (over 200k miles is mentioned), but owners report reaching a point of repair fatigue. Analysis based on approximately 24 substantive owner discussions.
Generation by generation
Owner insights per generation and US complaint/recall records (NHTSA).
Complaints and recalls by model yearWorst year: 2007. Years to avoid: 2007Source: NHTSA (US)Show table
Each year graded against the model's other years: Year Score. See all Mercedes-Benz GL years to avoid
| Year | Complaints | Recalls | Most-reported area |
|---|---|---|---|
| 2016 | 20 | 0 | unknown or other |
| 2015 | 35 | 0 | engine |
| 2014 | 39 | 0 | engine |
| 2013 | 52 | 0 | engine |
| 2012 | 78 | 0 | air bags |
| 2011 | 97 | 0 | air bags |
| 2010 | 66 | 0 | air bags |
| 2009 | 29 | 0 | air bags |
| 2008 | 89 | 0 | steering |
| 2007 | 123 | 0 | seats |
Complaint counts come from owner reports filed with the US National Highway Traffic Safety Administration. Higher-selling years naturally accumulate more complaints.
Specifications
Enthusiast code: X166
AMG GL 63 4MATIC G-TRONIC
5.5L 8-cylinder · 558 hp · AWD · automatic
Built 2012–2015