The second-generation Mercedes-Benz GL-Class (X166) debuted for the 2013 model year, replacing the original X164. It offered more space, luxury, and a new range of engines, including the torquey GL350 BlueTEC diesel, the popular GL450, the V8-powered GL550, and the first-ever GL63 AMG. A 2017 facelift brought revised styling, improved infotainment, and a new name: the GLS, to better align the full-size SUV with the S-Class sedan.
The most collectible variant is the GL63 AMG, which packs a 5.5L twin-turbo M157 V8 producing 550 hp. It's one of the few vehicles to combine genuine 3-row seating for 7 passengers with blistering acceleration and AMG's performance tuning. The diesel models attract buyers seeking fuel efficiency, while the mainstream GL450 and GL550 offer a massive amount of luxury and capability for a depreciated price, making them strong values on the used market.
Today, the X166 market is broad. The average sale price of around $23,000 is driven by early GL350 and GL450 models that have reached the bottom of their depreciation curve. Well-maintained, facelifted GLS models and especially the low-mileage GLS63 AMG command significant premiums, while high-mileage or neglected examples can be found for under $10,000. Potential repair costs for the complex air suspension and engine issues keep values in check for non-AMG models.
Buying Tips
- Check the Airmatic suspension carefully. Look for sagging corners when parked, listen for a constantly running compressor, and check for fault messages on the dash. Repairs can be costly.
- Scrutinize engine health. The OM642 diesel is known for oil cooler seal leaks. Early M278 V8s in the GL450/550 can suffer from timing chain and cylinder scoring issues. A full pre-purchase inspection is critical.
- Test every electronic function. Operate the COMAND system, power liftgate, panoramic sunroof, and all driver-assist features to ensure they work correctly. Water leaks from sunroof drains can damage sensitive electronics in the rear.
- Inspect for water intrusion. Check for damp carpets in the footwells and cargo area, as clogged panoramic sunroof drains and failing tailgate seals are common problems.
- Demand a complete service history. These are complex vehicles with high running costs. A full record of maintenance from a reputable specialist or dealer is the best indicator of a well-cared-for example.
Prices for the X166 GL-Class and GLS range from $9,100 for high-mileage examples to $253,000 for top-spec AMG variants.
3,644 Mercedes-Benz X166 GL-Class/GLS vehicles have been tracked across auctions and listings on Hypercars, with 1426 currently live. Sold prices range from $500 to $253,000.
Data sourced from Bring a Trailer, Cars & Bids, eBay Motors, PCarMarket, and Collecting Cars. Updated daily.
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