Used Mercedes GLS X166 Buyers guide (2013-2019) Avoid faults and common problems (Diesel/AMG)

Published at : 13 Dec 2025

Mercedes GLS-Class X166 used car buyers guide and owners guide for GLS350d, GLS400, GLS450, GLS500, GLS550, GLS63 as well as the earlier GL350 Bluetec, GL400, GL450, GL500, GL550. Should you buy a Mercedes GLS X166 if you want a reliable luxury Mercedes? Find out about the Mercedes GLS X166 reliability and the common faults to look for and what to avoid. This guide covers the diesel V6 engines, the gas/petrol engines including V6, V8 and AMG BiTurbo, and as is sometimes separately designated Bluetec engines. No matter if you are looking for an SE, Avantgarde, Sport, or AMG model you'll find useful information in our guide.

If you have been thinking about whether you should buy a Mercedes GLS-Class X166 from 2013 GL-Class, 2014 GL-Class, 2015 GL-Class, 2016 GLS-Class, 2017 GLS-Class, 2018 GLS-Class, and 2019 GLS-Class, or are curious about the facelift engine differences watch through our guide for the information you need. Avoid buying a broken Mercedes GLS that becomes expensive to repair by finding out the common faults to look out for.

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Creator -

Miles Goodson

Legal and disclaimer - Any content not originally created by The Miles Driven remains the property of the original owner and is editorialised for media reporting. All content is used within the confines of media reporting/editorial use and is transformative in nature to inform others with new information and content about cars and vehicles. We use no more of the original content than necessary in alignment with U.S copyright law for fair use and U.K fair dealing. We accept no liability for the purchase of vehicles using our guide and suggest thorough due diligence by individual professional inspections before making a buying decision.

The Mercedes X166 GLS was first released in 2013, our buyer's guide helps you to buy and own a Mercedes GL or GLS.